What does 助け (たすけ, tasuke) mean?

彼(かれ)の助(たす)けがなければ失敗(しっぱい)していただろう。

If it weren't for his help, I would have failed.

困(こま)ったときは遠慮(えんりょ)なく助(たす)けを求(もと)めてください。

If you're in trouble, please don't hesitate to ask for help.