Should I start my CV by telling about myself?
1) This is nonstandard, so people are likely to view you as odd, or at the very least unfamiliar with academic norms.

2) On a CV, you should prioritize specific, tangible achievements over things that literally anyone could say about themselves.  You say you have broad knowledge, but will anyone believe you?  It doesn't do anything to differentiate you from people who could also claim to have broad knowledge.  Save that for your letters of reference.