First, is there a full tutorial for both categories?

Next is Easy Mode allowed for any%?

Lastly, is there a true route for the games? As like "Which enemies to fight, what to buy, where to save paper toads, etc."

Thanks for any answers in advance.

A route for both categories are still being written out. Both runs see a lot of change real quickly, so things are consistently scrapped and re-written. Easy Mode is part of the route for Any%, just at the beginning up until the Twinsy Tropics Dungeon. Easy Mode is used for the entirety of Any% No IBG since Bosses take a very long time to defeat if you were to play on Normal Mode since the Bros are super underleveled since a majority of the bosses in the game are skipped. For tutorials on tricks, use the Glitch Playlist that is listed under guides here on the site. How to perform the glitches are described in the videos.

Thank you a bunch! I plan to do a first run in like 2 weeks. I'm going on vacation but I'm glad to say I will be a part of this game and community. 😃