This is the 7850th most frequent Japanese word.
喜べ
"喜べ" means "Rejoice" or "Be happy."
This usage of '喜べ' is an imperative form of the verb '喜ぶ', meaning 'to rejoice'. Used here to command or encourage someone to be glad.
状況が良くなっていると聞いて、喜べ。
Take joy in hearing that the situation is improving.
In this sentence, '喜べる' is the potential form of '喜ぶ', expressing the ability or opportunity to rejoice or be happy.
新しいチームメイトに喜べる要素がたくさんある。
There are many aspects to rejoice about the new teammate.
Here '喜べる' again shows potential form and describes the speaker's desire to have genuine moments of joy.