https://www.creativeshrimp.com/cycles-x-speed-test.html Cycles x is faster than cycles. Yay.
Tip- Displacement only works in cycles
A great tutorial of a lot of the settings in Eevee
Good starting place for cycles settings.
Cgboost has good tutorials, and this one describes how to use Eevee.
Grant Abbit has some good tips about Eevee Uses hdri in the world setting.
Cgboost one of my favorite Blender channels has some good cycles rendering tips.
SouthernShotty has good news about getting faster renders and ai Denoiser Fyi Blender 3 should have the new denoiser.
Blender guru has some more advanced settings techniques for cycles.
He uses several tricks and tips he shares to Add in fake hdri image lighting, radiosity shadows. Great tutorial and fantastic results in Eevee.