Here are some tutorials and similar resources to help you get started on your submissions.
- https://rmmv.neocities.org/ - What I believe to be the official documentation and explanation of the basic features of RPG Maker MV. Not totally sure, but it's a lot of help either way.
- https://rpgmaker.fandom.com/wiki/RPG_Maker_Wiki - An unofficial RPG Maker wiki
- https://www.rpgmakerweb.com/category/tutorials The official RPG Maker blog, filtered for tutorial articles
- https://www.youtube.com/watch?v=Qem-GC_LXp4 A video on starting your first project. Explains some beginner tips and tricks.
- http://yanfly.moe/comics/ A set of comics from Yanfly (a popular RPG Maker plugin developer) that walks through some tips and common pitfalls of getting your first RPG Maker project done. I personally found them pretty helpful.
- https://www.youtube.com/playlist?list=PL1ogjo2jwcJYiIK2qqMizt7GoygQ8OsB7 A series of 100 second tutorials on the basics of RPG Maker MZ.
- https://forums.rpgmakerweb.com/index.php?threads/rpg-maker-vxa-mv-mz-damage-flow... A flowchart explaining what order calculations are made in for damage in RPG Maker MV and MZ.
- https://rpgmaker.net/tutorials/1343/ Mapping tips
- https://www.youtube.com/results?sp=mAEB&search_query=rpg+maker+tutorials Various RPG Maker tutorials on Youtube
These resources are skewed toward MV because it's been the main release for so long, but most of the information contained above are easily applied to older versions too. For more tutorials and resources, a good place to start is the RPG Maker Portal, which acts as a hub for useful information: https://discord.gg/8wVaHRz
Good luck!