Was it the right decision to buy the Yongnuo YN685 speedlights and the Yongnuo YN-622N-TX controller kit?

I purchased my first Nikon D5100 DSLR in November 2011, that is, I have been actively taking a great interest in photography for a little over 6 years, and all this time I have done very well without sources of artificial lighting. Then there came an insight, a flash in the brain: “God, I desperately need an off-camera speedlight!” I checked prices for the Nikon SB-5000 (cost is 610 USD), then on “AliExpress” I noticed the novelty Yongnuo YN685N for 104 USD and… I bought two sets and the Yongnuo YN-622N-TX wireless flash controller (the total cost of the order is 252 USD), and to them to the heap – the tripod light stand, the white and black/silver umbrella, the flash diffuser reflector. All this stuff chosen almost at random, since I could not find an intelligent guide for inexperienced amateur photographers on the choice of flashes and accessories for organizing a home photography studio. Well, I will try to fill this gap and tell in simple language to beginner photographers what speedlights are needed for, how to setup them, how to choose batteries and a charger for them, how to take images at a professional level. I hope that...