The proverb 'A bird in the hand is worth two in the bush' means:

Nothing great lasts forever

What you have is better than what you might get

It is necessary to take the first step to reach your goal

What you have is not better that what you might get

None of these

Explanation

It is a proverb which is said when you recognize that you should not risk losing something you already have by trying to get something you think might be better