If you are looking for datasets from amateur astrophotographers to practice with, there are a number for useful resources.
Processing is meant to be fun! If you really need help with a particular dataset, jump on the forums or contact us directly for some pointers - even if you're just using the trial.
The IKI Observatory is a remotely hosted astronomy setup in Castilléjar, Spain at https://www.pixelskiesastro.com/. FLO / Ikarus Imaging have sent out a setup in partnership with Optolong Filters and Starlight Xpress. The projects purpose is to provide a community based remote setup that can be collaborated on on Star Gazers Lounge - the data is made publicly available free of charge and the targets are chosen on the SGL forums.
The difference between 'Deep Space' and 'Lunar/Planetary' mode, is the way reconstructed highlights are treated.
By cross referencing the normal image with the MaxRGB image, it is possible to find deficiencies in the colour balance.
Their operation is intuitive; is there too much red in your image?
You can convert everything you see to a format you find convenient. Give it a try!