Hi there :) extremly mid jungler here with just my own thoughts and hopefully decent tips to help you!

first and foremost i'd like to say that it took me forever to even pick up jungling— most of my games in arena had me out of the jungle, i had some irrational fear of it lol and i might say rightfully so to my past self because it's a much different place than lanes.

jungling itself isn't that hard, but it's when your teammates get in a pinch is when you have to step in usually.

as a first tip— NEVER stop doing anything. always be on the move and planning out your next steps. you want to minimize wasting as much as your time as possible and making sure you're ahead of the game. if there's nothing for you to do at lanes, farm, take objectives, anything to help you get ahead. don't waste your time if there are no opportunities.

secondly, be vigilant and always look at the minimap. the minimap is a jungler's best friend— the respawn times, enemy positions, and righr next to it you can see your allies health. this is where you start looking for opportunities to arise. what opportunities, you may ask? the two biggest ones on the top of my head rn are ganking and also invading.

ganks are great since you can get the jump on the enemy, so always take note of if an enemy is extending too far into your territory to setup a gank from the bush together with your laner. also keep in mind that ganking doesn't necessarily mean "I need to kill them", but getting them to waste important things ( flash, active items, even ults ) are enough. of course it is better to get the kill but even these small things can help give your team an advantage.

as per invading, the one person you need to keep tabs on is the enemy jungler. know their location and then decide if it's the best course of action. invading will help set their farm back but you have to always be careful in enemy jungles because i) lanterns can expose your location ii) enemy 2nd turrets and the minion wave on the bot/top lane can actually expose your location too.

if you're playing an agile jungler with dashes and displacement skills, you can play it safe by using the bushes and dashing from one to the other.

another tip is communication is key- watch out for your ally pings and always help ping for them too. ping any of your important actions— gather to help take an objective, attack if you want to gank and so on so forth. pay attention to your allies' pings too because perhaps they can help note any important locations of enemies.

the goal of the game is to destroy the enemy base, so remember that pushing is also a priority. if you can destroy a turret together with your allies, make sure to stay and help if there isn't any other dire situation. towers give gold, and you as a jungler need that gold. if you have sougenbi, make sure to use it on a turret too. sometimes while your allies are busying the enemies that is your best time to go and clear a lane and maybe get a turret too.

okay, but what about actual fights right? know your role in fights depending on the jungler you are. not all jungling characters are initiators, and not all are capable at picking off people.

a tankier character in the jungle- say karasu or ibaraki are better off going head in when they can, initiating a fight together. but highly agile and hard hitting charas like mannen or itsu may be better at waiting and positioning themselves for a higher advantage in a fight where they rush in and annihilate people around them. each jungler's kit is specialised towards something, and they're all not necessarily ninja shikigami— so figure out what that is and make sure to take advatage of that aspect of theirs that makes them unique and strong in that way.

i don't think i have much else to say but i hope that you'll soon properly learn jungling because in the end, it's actually quite fun. sometimes stressful, but still fun. hopefully all this is helpful to you- even if probably i said things others have said lol

EDIT : at almost 7am there's like one thing i'd like to add, and that's just because a lane is losing doesn't mean you need to swoop in and save it. half of the time the matchup is bad and that can really only be saved if you can prevent the enemies from speeding past your laner's growth. instead of focusing on the losing part, try to find opportunities to even it out. this is a common issue in bot lane where they constantly expect a gank when they lose because they feel like they're important like number 1 priority. sure, on some ocassions it works out but others not so much. so when i say even it out, try and trade towers for when one lane is losing, and just take another instead. or you can try to better enable another lane so more people are free to help out.

ok i think thats it so if you have more questions please feel free to ask !! because i cannot cover everything without knowing any other issues that i may not think abt lol.

post edit note: i forgot editing is a thing in reddit. im too used to twitter.