The gameplay or LoL is boring and repentive as far as I know. I dont get why so many people like it.
It's definetely less repetitive than WarLight, I'll tell you that much; you're not stuck with several basic commands such as deploy-attack-transfer.
Any advice on where to find a stream that'd allow me to understand what is going on? For now I only know game mechanics and only a few champions, so an average stream is incomprehensible to me.
Well, judging you are a newcomer, you'll want to look around YouTube videos dedicated to EXPLAINING, not Twitch streams dedicated to entertain a player's fanbase. YouTube generally offers gameplays that are not focused on pleasing fans, but teaching them. Players that post on their youtube accounts generally post several guides as well. Pick a champion (or role) you like, and take a quick look on youtube for very specific and nice hints. Then try to slowly apply them in game
When you feel more comfortable of your knowledge, you can try streams, and here are some suggestions:
Streamers tend to have very... weird streaming times. Ideally, you'll pick some that you like and follow them on other social media such as Facebook, Twitter or the kind to keep up with their games and watch it.
First off, the language barrier; there are no dedicated polish servers (european servers are split by west, east, russia and turkey). So any region that uses english to communicate is ideal. These are:
North America (NA)
Southeast Asia (SEA)
Europe West (EUW) (also known as the land of disconnect)
Europe Nordic and East (EUNE)
Second, the regional barrier. Ideally, you should watch streamers for the server you play on, as they tend to stick to the metagame and general picks/mechanics used in your respective region. If you live in Poland, the default is EUNE, but you might have changed that during your first login. Remember, this is optional, just ideal. Nothing stops you from taking up any other stream.
Another thing you could try to do is catch up with the competitive tournaments going on in each server (LCS EU is the one for EUW and EUNE) and watch their matches when they show up.
Several hints for any newcomer:
*Avoid Player vs Player until level 7 at least. Before that, you'll see a considerable amount of alt accounts (also known as "smurfs" in League for whatever reason) and you'll have a bad time. Ideally, hold off to 10; if you're desparate or have a friend to help you, then you can go earlier like level 5.
*The easiest role to learn, in my opinion, is the Top and Mid lanes. They have straightforward 1v1 situations most of the game, where you are permanently building up very few stats. AD Carry and Support require more team play and knowledge of how to move while attacking, so they are much harder to pull off.
*If you have a friend that is much more experienced than you, then you should actually try playing AD Carry + Support with him. These two go together in the bottom lane, and there, your friend can watch you playing and point your mistakes with more ease, as well as help you fight and survive.
*Doing the jungle on early levels is near impossible due to the lack of Masteries and Runes to soften the enemy monsters, so I'd reccomend leaving it to players in Alt accounts. If you're playing with a friend and he's considerably better than you, if he goes Jungler, he can constantly give you coverage in your lane.
*Never lock the camera on your character. It's a mistake I insist on, for playing for years with it. If you can unlock the camera from your early days, you'll get used to it and don't have that problem. It can be compensated with good map awareness, but that takes much longer to develop.
*The reccomended items are never ideal or perfect, but are always acceptable. Play building what the game tells you to until you've grown aware of how items work, the reccomended builds are never that bad.
*Mobafire guides are not very credible. Any other websites with guides tend to be better. Lots of people trust Mobafire's suggestions far too much.
*450 IP champions are extremely cheap and very effective, while also being very newbie-friendly. Annie, Warwick and Soraka are easy champions to learn and not very hard to master, while being extremely cheap so that anyone can buy them.
*The newer the champion, the more complex it is. Not entirely a true statement, but the most recent ones have been much more diverse and complex than the past ones, so avoid them for now. I speak of Kindred, Azir, Gnar, Ekko, and the kind.
*You can toggle on and off a 'global' chat on the settings, so that you can listen to the enemy team and message them using /all before the message. Be careful when you turn it on, for generally you'll see nasty people calling each other every possible name they can think of. Trust me.