what is the best mode to play as a begginer?

i prefer 10 min

the reason is as a begginer you should improve your accuracy rather than speed

if you want to improve in time the its better you play blitz and bullet

Longer time controls. At least 15|10 (anything below will be too fast to think about position clearly and you will make too many mistakes), and if you can, play either 30 minutes or longer. 

Speed chess is not good for improvement.

Try Daily chess.

You can spend as much time as you need thinking about each move without the time pressure.

You can play as many Daily chess games as you like simultaneously.

You can also make a move and spend some time thinking about whether it is really correct before you submit your move.

Then after you are consistently making the correct moves you may want to practice speed chess.

speed chess help simulate faster thinking, I am usually up 3 or 4 minute in my rapid 10 minute games. I returned to rapid and hit an 1330 highscore. FEAR THE BIRD!