Gammar, is important?

[color=yellow]Someone think grammer is important to us to use English.
But I think Using English in the life is more necessary.
Can you help me to solve this problem? 8)

why type in yellow :?: not very mature if you ask me. grammar is important if you are going to go to a job interview and you want your employer to think you know what you are doing. l dont use grammar that much but im not typing formally.

i cud typ lyk this but ud tink its not gud. simple isnt it