If you want to play bard you need to know some things, dont ever EVER throw your r in to stun your teammates (unless its a karthus ult or they are burned) if enemies are nearby if you do that you dont set up kills for your team but for the enemy. Try to think when to use your q and r for exaple- if you just stunned 2 enemies try to position yourself in a place where you can stun them both with your q afet your r ends. Your heals dont do much untill 2-4 items so try to place them behind teammates but after banshees you can start placing them on your friends(or if they are abt to die). Your e is a powerfull tool so try to use it wisly, remember to help your immobile teammates(not talking abt yasuo) to get ofer walls that would take ages for them to walk around(baron,drake,and jg camps for chasing enemies), be carefull of some places on the map that are bugged and will make your e uselles