Welcome EgorTheRed! Many of us older guys are just getting into drones. Many of us have questions, especially about the technology, but also about the situations we find ourselves in or the areas we fly - or wish to fly.
I've had a Mavic Mini for about a month and a half - and LOVE it. I can't believe how much there is to learn and how stimulating the whole drone "thing" is. During this COVID-19 lockdown thing, the drone has given me something to focus on, something to enjoy while outdoors and alone. Something to take a road trip for, and then come home and start viewing, editing and, occasionally, posting video or photos.
It is amazingly easy to do something stupid, so when people say, "read the manual" and "practice RTH" (return to home) they aren't just spouting off. If you don't want to lose or damage your drone, take it step by step. I've been there, with my heart in my throat thinking "oh, sh**!" So far, I've squeaked thru. Haven't lost or hurt my Mini, but I have had to change two pairs of propellers... I watched dozens and dozens of YouTube videos and continue to search YouTube and this forum when I have questions.
You are in for a really good time! Happy flying
ps: The DJI Fly app is your only choice with the Mavic Mini.