I will make a solar system and nothing will stop me

yeah for rings you need to use a program that can create png's
@DragoranosSR2

@Zenithspeed
thx!
I added a ring texture but the texture had no transparent background so it was absolutely terrible.

right... even with my poor memory i'll try to help as much as i can

to add textures to celestial body, simply go to the texture tab (appearance of a square filled with diagonal lines), press the plus to add one. you'll be directed to the current celestial body folder (in game), leave out of there and into the Terrain Textures (i think its called that?) folder where you'll find all of the textures. simply pick a texture you like, hit confirm or add or whatever, and bam you have the texture, you can also adjust its brightness (sometimes textures may make the surface very dark or very bright) and strength (to increase or decrease detail; you can also put this into negative values to get some really funky stuff); this goes the same for ring textures although their textures appearances can't be configured, only the size of the ring

to add textures to the game itself, you need to find the SupportFiles folder in the CelestialDatabase folder of the game (keep in mind that there are two of these, one for your own creations and one for downloaded ones), however the paths leading to these are of course different on each device, so i can't help too much there. once you've found the folder, paste/add the texture into it, you can try to make your own texture, which, while it is doable, you notably expressed your "skill at being bad", so the only other option is to download terrain textures, there are a multitude of sites but almost all of them require an overpriced subscription and maybe even additional payment just to get the texture, either way you need to look for the keyword seamless in order to get smooth and clean textures