Tips for CS GO

For starters, try to shoot with a weapon on the aim-map

learn maps, granades spots, play in private servers with pro players

Try to do Tap shots(single shots) or burst(3-4 bullets), spraying is very hard and you have to know the recoil of the weapon.
Ak47, tec9,awp,deagle, mac10(Second Round if you win the first) (T-Side)
M4A4 or M4A1-S, fiveseven, usp, deagle, mp6(Second Round if you win the first) (CT-Side)

don't spray

learn recoil patterns

learn movement

and you will be better than 85% of the players out there

if you want to get better try surfing and bhopping then move on to retake servers

play with a team of friends you can easily get frustrated with strangers because you dont know them and their playstyle

It's My Idea. Delete Cs:go and play another games )

Aim maps mate, and just practice. Watch some pro's play, check all corners and make sure your crosshair is always kept at head height not looking at the ground like most low rank players do.

PLay it alot and you will get better. watch a few streams, or a little youtube

DONT peek planted bomb instantly when you hear a defuse sound, wait about 3 seconds and then peek.
DONT aim at the floor/legs
DONT peek when your reload isnt finished.