if you found a texture online or something like that how would you import in in to blender and be able to use it?

Right-click it and choose “Save Picture As” and put it in your texture folder. Then copy and paste the web address and any info about the pic to a Notepad file and save it in the same folder with the same name as your pic so that if you ever use it in the future you’ll know 1) who the copyright holder is, 2) who to credit with that © and 3) who’s going to sue you if you ever make any money with it.