Resources
I recommend the following YouTube channels to both beginners and skilled astrophotographers.
As an aid to processing and skills development, the following links may be of assistance:
Spectroscopic Color Calibration (SPCC) by PixInsight
Gradient Removal by lukomatico
BlurXTerminator by VisibleDark (includes interview with Russel Crowman)
StarXTerminator by Hidden Light Photography
NoiseXterminator by Adam Block (includes interview with Russel Crowman)