League of Legends (LoL) Question: Jungling basics

Main things when jungling:
1) Map awareness, know where is the other jungler and wich lane will probably push so you can prepare the gank before.
2) don't just gank and forget to farm, you need gold to keep the adavantage.
3) "make them pay" if the enemy jungler top, you can gank bot and go for dragon, or invade if mid and bot push enough. you should try to make deep vision too.

Most of the other things you can learn by watch streamers, youtube and guilds on this site.

just keep playing and learning, see what you do better and what you can improve.

usually i always try to gank on level 2 after red if champion is good at it - kayn, irelia, etc.

when i play ww, i rush jungle item and lvl 3 - then go dragon right away (no ganking until then).

also it may sound counter intuitive but don't gank lanes that have already fed (2-3) death, it's much better option to gank winning lanes and make them snowball.

There is no way for me to explain how to jungle on here as it is completely differenet to lane and you need experience. If you want to learn to jungle I suggest you watch people like Foxdrop and Virkayu on youtube