2d game question

Ok am pretty much completely new to unity and for the first very basic game am going to try and make a 2d platformer so i just had a few questions about that
1)should i be using the sprites fir everything like characters and terrain or are their other ways to add that in

2)can i make 22d pixil art in blender and use that texture fir terrain

 

1. There are quite a number of ways you can do things. You could make a 2D game using only 3D assets, for example! You can create custom meshes of planar faces that you texture. Or you could use voxels. Or yes, sprites.

2. I'm not sure how you'd create pixel art in Blender, unless you mean just blocky models. But yes, you can create whatever you want in Blender and import it into Unity. Just nothing that relies on the Cycles rendering engine, as those materials don't transition over.

 

Thanks i will look up more about this stuff and try to decide which one i will use