Gimp photo editing tutorials

Merci beaucoup. I am new (very new!) to GIMP after many years as a fairly basic user of Photoshop (I also dumpted LR for RawTherapee).

If you shoot RAW, can I ask what postprocesing you do in a raw developer and what you save for a pixel editor (e.g., GIMP)?

In your opinion how does GIMP compare to Photoshop?