He thinks of himself as a jack of all trades.
Meaning of the underlined phrase-

Complete Sentence: He thinks of himself as a jack of all trades.
Bangla Meaning: সে নিজকে সবজান্তা মনে করে।

Jack of all trades:
Bangla Meaning: সবজান্তা।
English Meaning: a person who can do passable work at various tasks: a handy, versatile person.

অপরদিকে,
বিরত থাকা- refrain from.
সাহসী- Brave.

Source: Merriam-Webster Dictionary, Accessible Dictionary.