“Groove” is a common English word with several meanings. It can refer to “a long narrow channel, a fixed routine, top form, an enjoyable rhythm (in music) or an exciting experience.”

“Find your groove” is an idiom that means to find a situation or rhythm where you can do something easily and enjoy it.

You can use it to talk about dancing:

“That’s it, find your groove, feel the groove of the music.” Here, “groove” refers to moving with the rhythm or the rhythm itself.

You can use it when you’ve found a good routine and things in your life are well balanced:

“I’m beginning to find my groove again.”

“I can’t seem to find my groove today. Everything is just going wrong.”

It could refer to dancing but it usually refers to tasks. At work, you find your groove when you are very focused and productive. When everything comes together mentally and physically, there is a rhythm to what you do. You “find your groove” when you can do something well and easily, especially because you do it often.