Look at guides on youtube too much to type
but generally.
Learn objective priorities.
Vision is power freaking ward everything and learn good ward spots.
Only take drag or baron when either. both bot players recall on other team or are dead. enemy mid laner dead etc. Have a numbers advantage.
DO NOT GANK A LOSING LANE. but also do not gank a winning lane but do help push down his tower.
When a lane is losing screw it feed the other two lanes and focus on getting gold to the person that isnt a total scrub. too many times you will gank a losing lane only to give enemy a triple kill... not worth it unless other team is like at half hp and you get the double kill or something but never gank a teemo or some shiz thats 2 or 3 lvls above you and your laner