Lightroom won't scan a folder of photos and use image recognition to group photos. Lightroom will require you will to manually assign tags to the photos then search on the text you have written to the metadata.
You could use the facial recognition to organise and find people. I've recently done this searching my 140K catalogue for image of a friend that died.
I use lightroom, it's brilliant as a workflow tool, the library function is great for organising and finding images. I would however read/watch the beginners tutorials to get the idea before you start so you start off on a good foot
https://helpx.adobe.com/uk/lightroom/tutorials.html
It helps if you have a folder structure already for finished images (or ones you've previously taken). So I have top level folders for different subjects, Family, Work, Cars, then subfolders underneath for years, then the occaision, i.e. Cars\2017\London car show, Family\2017\holiday etc
As an example, to get your images into Lightroom, you import them. If you already have a folder structure of existing images you can import them where they are, if you're importing new files, I import my raw files to yearly folders (as lightroom likes to store new files in folders of the date the image was created). Lightroom creates a catalogue file, a database of images, doesn't store the images inside it, so doesn't duplicate storage.
Then when you import, you can tag it with key words, so using my theme above, key words would be family, holiday, place name, maybe names of people.
Then once the images are in, you create collections within Lightroom. Again I use the same convention as before so I have collections named Family, Work, Cars etc, under these you have sub collections to further subdivide, such as the event. You just move the images imported into the relevant collection.
When all that is done, (it's quite quick don't panic) then you have a number of ways to search. By the keywords you tagged the images with when importing, by the collection, you can look at the folders the images are in (which in my case are by year, then date) or you can search by attribute, metadata (i.e. show me all the images taken with a certain lens, body combination etc ).
Mostly though it's quick to sort by collection.
On top of all that - it has a map module. If your camera has gps, or you tag your photos with the location, you can search on images in the world...
Very good program - and thats before using the editing/processing develop module or the other modules.
But it is worth watching the tutorials just to get the idea behind it as most people confuse it with a editing package when it's much more than that.
