The first guide involves different kinds of jumps you can add, while the second guide give you a basic understanding on how to create a platformer (and also has links to other platformer guides!)
Here’s a few different concepts for platformers I can come up with off the top of my head:
1-Difficulty chart (This involves multiple different levels, with each level getting harder and harder).
2-A tower style platformer (This involves you creating a long vertical rectangle going from the very bottom of your map all the way up to the very top, leaving no room for the player to escape till they reach the top).
3-A themed platformer (Just think of character or things you like! Examples: Hello Kitty, pizza, Superman, sea creatures, etc. Once you pick something, you just base the whole platformer around it).
Additionally, you can use the search bar at the top right of your screen to look up guides about platformers and do your own research! Happy gimkiting