for those who use 2020 version: don't screw with polygon removal, it may cause problems with cutting while using vertexes. Instead, create a cylinder with height set to 0 and 1 segment cap - this way you'll effectively create a plane. Then proced from 11:59. Cheers
Your tutorials are great... please add tutorials of unwrapping and texturing of the models you already made and will make if possible. It would help a lot. Thanks !!!