Tip nr.1 - Unless you play Capture, focus on killing minions and staying alive. Don’t mind about getting enemy kills. If you damage them enough to make them retreat from lane - you won, no need to chase. Minions are the main source of your leveling. And especially early on. And there is nothing as frustrating as playing underleveled character. Once you hit level 4-5, group up more with team and go for team fights. But still don’t forget about minions.
Tip nr.2 - look at minimap at least every 10 seconds, you will have much better understanding what’s happening around you.
Tip nr.3 if you see that you are alone, fall back closer to your logistic buildables/turrets. Even the slowing one can make more numerous enemy force work quite a bit to dispose of you.
Tip nr.4 - if you are low on health and are not healer char (and there is no healer nearby), retreat a bit and press “B” to teleport to base and this way get a full health. Not dying is one of more important objectives in this game.