First off, WHY 'Go Manual'?
I didn't spend umpety hundreds of quid on an all singing, all dancing auto-everything Widgetal SLR to turn 'off' all that 'easement'...... if I wanted to do 'faff-feux-tog-raffy' I'd pick up one of my all clock-work film cameras..... so this is a serious question.
Usual answers are "'Cos the Pro's shoot manual" Which isn't true... pro's get paid; and time is money; you dont make much of a living 'faffing' you get paid taking photos. Next one is "To take control".. which is a bit like handing the keys to your new car to a todler before they have had training wheels taken off thier pavement bike! "Control" is ony any good f you know what to do with it!
This suggests, not just reading the manual, BUT reading some tutorials, doing some learning, as to where and when 'control' may be a good thing to take....
There's a heck of a lot of 'expert' programming gone into most modern electric picture makers, the camera probably has more picture taking know how than you do right now....
There's three places you ca effect control on a camera...
1/
Composition. Where you point it! THIS is where most of the skill is. Finding stuff worth taking a picture of. You don't need to go manual to do that, and going manual wont help you any.. learn where and when and how to point the camera... read up on the rules and theory of composition, and lighting. THIS is all outside the camera, and got very little to do with buttons and dials and settings... B-U-T if you want better pictures, where you'll make MOST difference.
2/
Manual Exposure. This is the practice of measuring the light levels on your subject and then picking shutter-speed, aperture and ISO setting to get a good 'exposure'.. how bright or how dim your photo appears. Read this:
Exposure - Exposed!
Walks you through what an exposure 'is' and actually just how un-critical an 'exact' exposure is..... but gets you started.
For the most part, you will get a perfectly acceptale exposure using one of the 'auto' settings of your camera; if you want to give it a better idea whch settigs yo ight prefer vis aperture and shutter and the 'effects' they have on the photo, then the semi-auto modes of aperture-priority or shutter-priority will likewise take you a long way, you dont need to go 'full manual'.. and absolutely ridiculous to go full manual and faff about picking shutter and aperture settings to balence the light-meter indicator n the view finder.... you are merely doing exactly what the automation would with a LOT less faff....and givig yourself a heck of a ot more chance to ompletely miss the picture or cockup the settings! Of ALL the places you can 'take control' on a camera, this is the one so many dive straight nto, because there's an obviouse setting on the exposure mode dial that says "MANUAL".. but it's probably the least usefl, either to learning where when and how to take control or to get it!
By all means, read up and play, BUT this is far from the be-all and end all of photography.
3/
Manual Focus. The fogotton 'manual' on modern cameras. AF ssystems have been with us for around twenty years ow, and most are pretty good; B-U-T they are far from infallible; and of all the automation in a modern camera, its the one bit that is probably still least reliable! There are a few different auto-focus schemes on modern electric pcture makers, you may choose from, picking the number of focus points or area they use to find a focus setting, BUT they have one in-built problem.... they all try and find a distinct 'subject' to fix a spot on! They don't focus very well on thin air.. but THIS is where you may actually get most from 'maual' control.... problems such as 'focus hunting' when the camera cant get a dot on something, wont happen! Focus lag, the focus trying to shift as subjects ove, wont happen, and effecting manual control.... you can get around both these niggles; more you can get past the 'real target' issue and put the focus 'zone' exactly where you want it in the scene. In the days of film-only cameras, we HAD to learn this; many non SLR cameras were 'Zone Focus' we had to exploit 'Depth of Field' picking the appropriate focus zone and aperture, the cameras just didn't have the catcall focus mechanism of modern SLR's; using SLR's which did, we had to focus manually, and we had to carry on exploiting DoF to get it where we wanted... NOT where a red dot thought it should be..... consequently the 'art' of focusing is one that is becoming rare, and folk moan about focus accuracy and focus speeds and grumble about cameras and lenses they blame for not focusing as well as they hope.... yet, it's a niggle born of the fact they don't really know how to properly focus... and rely on that bit of 'auto' whilst they faff with settings, insisting that they are taking control.. doing exactly what AE would, making settings to the meter! Then grumbling they don't get the shallow focus effects or 'Bokah' they like.. and start chasing it with super-fast aperture lenses.... to grumble about the AF! Bokah BTW comes mostly from the subject; not the lens, so ts back to item 1/ for that.. whilst shallow focus is often making life hard to get 'disassociated' back-grounds... which ISN'T about using super wide apertures to make the DoF a razor blade around the red dot... bit exploiting the Focus Control to put the DoF zone where you want it.... which MAY mean focusing thin air in-front of your subject so that the back-ground falls out of focus, a things like that.
IF you want to 'Go-Manual' leave the ruddy exposure control on one of the Auto-Settings! Read up on Manual Focus and focusing techniques, particularly 'Selective Focus' and 'Depth of Field', and if you use a 'manual' setting o the camera, turn FF the Auto-Focus and go manual there! This is where you will start to learn where and when you MAY better exploit manual control and start doing stuff that the camera wont do or do well for you, with the easements turned on.
BUT... back to top... I didn't buy a very expensive, all singing all dancing, auto-everything electric picture maker to make life HARD for myself, or play with knobs and buttons.. I bought it to TAKE PHOTOS!!! That is what its about at the end of the day... and it matters not a jot how fancy my camera or how much I know where and when to take control, or do or don't... what MATTERS is the subject.... what matters is the subject lighting...... if I don't have a decent subject or decent lighting,I am NOT going to get a decent picture, no matter what I know, how much control I effect or auto-easement I rely on......
COMPOSITION COMPOSITION COMPOSITION... 99% of taking a photo is IN-FRONT of the camera, not in it, less still in the buttons and dials and switches!
THIS is where you start taking 'manual' control; thinking about the photo; and where to point the camera! And three questions...
1/ WHO is going to look at this Photo?
2/ WHY are they gonig to look at it?
3/ WHAT is it in the picture that will interest, entertain or inform them?
I could go take lots and lots of photo's of the birds in my back garden. I could proably make a half decent job of them as far as technical dexterity and competance... BUT... I don't know a darn thing about birds.. I wouldn't know a wood-pidgeon from a woodcock.. I might just about spot a chicken.... if t was roasted and served with potatoes and peas.. but I REALLY don't have much interest i the things.. so why take photo's of them? Many folk do.. and they know what they are looking at... but I don't have any interest in their pictures.. so why show them to me? Why take them? A photo that isn't looked at has no reason to be.
I have hundreds of photo's of obscure bits of old motorbike. Motorbikes DO interest me, but.. do I really need or want a photo of the vacuum take off plug on a thirty year old Honda 125's carburetor manifold?... "Who?" I have an audience in mind; folk who want to do mechanics on that bike. "WHY?" To show them what a vacuum plug looks like; where to find it, probably so they can balance their carburetors "What?" Well, I doubt they will be jumping up and down shouting 'fantastic' about my photo, but, if they are encouraged to do the job that needs dong, and it aids them doing it, then mission accomplished. It doesn't have t e pretty; it doesn't have to be 'artistic', it doesn't have to be of a rare or exotic subject, it JUST has to have a purpose; from a casual snap of auntie Mable at a Christmas party to the daft couple getting married.... a photo needs a purpose to be.... if t has a purpose, if it has an interest, if it has an audience, 99% of the job is done, its a 'good' photo. A perfectly composed, perfectly exposed, wonderfully artistic photograph no one has any reason t look at is a wast of time..... so going manual.... taking control, STARTS wit these three questions, and applying that bit of thought "Who? Why? What?" before you even pick up the camera; less point it, less start prodding buttons... but THAT is going manual.. not just taking control, but taking charge, ad having REASON to take charge.. and buttons and knobs and menu's really are a tiny tiny part of that....