I want to learn how to start making games and this program seems like a nice way to start learning.
But does it have Isometric capabilities? Like 2.5d?

There is no built-in feature for 2.5d, but if you can code it, pico can do anything ;)
There a lot of iso games already on the platform.

@TheCyanSpartan Hi!

I think you are sort-of asking two questions. pico8 is a great way to start learning how to make games. I advise you to start with the built-in tutorials to see how to draw things, how the draw and update loops work, how to make a simple platformer, etc.

Isometric or 2.5D capabilities? Lots of folks, including myself, have made varying degrees of pseudo-3D games with different strategies. pico8 is "built" for 2D games, so I would advise getting comfortable there first. I've posted some of my favorite psuedo-3D games below (including my own). Some folks have written full-blown 3D games (https://www.lexaloffle.com/bbs/?pid=32480#p @electricgryphon) but these are pretty advanced - definitely above my level of comfort. I recommend checking out some of these below to see what they look like to get some ideas.

Marballs (isometric view, 3d internal gameplay): https://www.lexaloffle.com/bbs/?pid=12502#p

Hungry Harry 3D (fixed camera 3d, my own game) https://www.lexaloffle.com/bbs/?pid=59509#p

PicoKart (Mario Kart, mode7-like rotating map) https://www.lexaloffle.com/bbs/?pid=17739#p

Lands of Yocta (voxels, first person view) https://www.lexaloffle.com/bbs/?pid=41198#p