"bit" or "a bit"

[jayan12]

I am bit tired

or

I am a bit tired

please explain the difference

Thanks in advance

[Raymott]

I am bit tired

or

I am a bit tired

please explain the difference

Thanks in advance

The first is not proper English.

[sarat_106]

I am bit tired

or

I am a bit tired

please explain the difference

Thanks in advance

Just to elaberate Raymott's view:
Bit is a countable noun and requires to be followed by an article. It means: a small piece or quantity of anything,
a bit, means: rather or somewhat, a little
quite a bit, means: a fairly large amount