by being smart
i learned the cyrillic alphabet in a few hours and started to learn some basic words, basic grammar. i also did a few lessons of an old east german russian text book of my mum and ans few weeks later i started to read some simple russian texts.
i also did a few duolingo lessons as their grammar explanations for the russian tree were written quite well its not a meme, CHECK THEM OUT
i listened to some obvious russian songs like закрой за мной дверь я ухожу or твои глаза and ofc some communist ones too, learned some on my guitar and remembered the lyrics and I also played LoL with some russians who joined my discord and picked up some words there and a girl of them once sent me 3 russian manga books because i always asked her for russian manga (pic1) sites and torrents. she and her friends also taught me some russian social rules like always writing someones name with an initial capital letter because not doing it is considered rude.
the last step of my journey was playing some fan translations of old GBA games such as zelda the minish cap and pokémon smaragd on my phone. (pic2) the reason why I chose GBA games is that due to the low resolution display, long and complex sentences with hard words are 404 because it would require an entire one of the two text lines on the screen for a single long word. I looked up all the unknown words i found in the games dialogues and the ones I encountered multiple times I wrote on a vocabulary book and memorised them. (pic3)
all this taught me quite how to read russian, I can read more than half of what is written on /ru/ which I consider to be a nice achievement for 1 year of learning.
however, be aware that this method of learning will not teach you how to speak or even understand spoken russian at all - instead you only learn how to read and write in a way of how us euros learned latin at school.
reading/writing was exactly what i needed though so i did all this on purpose. i never really planned to talk to russians, i decided to learn their language merely to be able to browse the russian internet.
being able to navigate easily through rutracker, having a nice decoding minigame everytime I encounter a russian meme and decoding random YouTube comments are probably the biggest benefits i gained of learning russian, it probably also was a nice exercise for my brain i guess?
not being able to understand russian WEBMs is the biggest con of this method, but also the only one i found so far, so be aware of that.
All in all I rate learning the russian langauge with a solid 6/10.
You should only do it if you have a good reason for doing so.
It is a beautiful language with many cool things to discover like cute words as малина (malina) or tongue twisters like взрослые (vzroslyye). Sometimes it indeed does sound a bit like a cave man language for me because of the missing articles.