People suggest cook book as a start, however be careful that complicated receipts are tedious and might remove the joy of cooking.
Most actually good receipts are also simple - keep that in mind.
My two cents will be to find simple stuff and start from it.
You will discover that most cooking consists of
"Fry onions / other vegetables"
Add meat.
On the side boil some granes or potate, mix in.
2.5. Or smash everything together into the oven and wait.
It is possible to have a nice home cooked meal without the major struggle if you learn simple receipts.
And then you can start buying food based on your knowledge of cooking - keep the stash of universal cooking supplies is as important as the cooking itself.
First thing - regardless of the decision, your internal attitude might be different - you can equally be happy that you stayed or sad that you left or the opposite.
Those are your internal bearings unrelated to the action itself.
If I would be you, I would leave Russia, sis.
Ongoing country dissolutions are too massive events to be bothered about by a single person + Russian chance for a positive societal change was lost a long time ago (I stuff like unrests of 2012) and the main portion of society decided to not support the protests.
Next events are logically will be much more nasty than any peaceful demonstrations, and being next to them is hazardous.
You are young, and mobile, why do you have spend your life on the problem created by the previous generation?
Leave for a bit, let them sort it out themselves, and come back later if you miss it.
The best in moving somewhere is that you can try, and always come back if you regret.