I was recommended by a friend to watch pishifat's videos on how to use the editor. But I still wonder if there are better alternatives out there or is his YT channel the way to go?
Yeah if you wanna learn the basic of the editor/ mapping i'd say some of his videos such as this one could be quite helpful. If you want to know how something specific works you can probably just google it and find something or a guide on it, or just ask
You could get started on mapping as soon as you read the wiki page, learning how to utilize the editor correctly takes actual practice. The pishifat videos also work but nothing beats practice.