Not really sure what you are talking about. "rotate" is on the main tool box and exactly how to do it was first google result.

https://docs.gimp.org/en/gimp-tool-rotate.html https://docs.gimp.org/en/gimp-layer-rotate-arbitrary.html

Tools you know will always be faster then ones you don't know but that doesn't help people who don't yet know any of the tools.