i wanna make a house but the texture i want for inside dont match outside placed ones, how to i retexture the walls so i can have a new wallpaper in a sense
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Assuming you have a wall with thickness, like a cube you can assign the inside triangles a different material. You can do this in the modeling mode-> attributes menu-> edit materials.
1 add a new material slot
2 assign materials to the different slots so you can see the results
3 select the triangles you want to assign a new material to
4 select which material you want to assign
5 click on assign active material
6 click accept
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Hello @endofthehall ! I actually just wrote a Forum question about material slots like this! Even though the modeling tools allow us to add material slots to meshes, should I avoid slots and start baking all of my textures to UV maps instead, to save draw calls? I really like material slots, and I would prefer to keep them as a part of my workflow/artstyle. I’m working on a materials tutorial where I was going to mention Material Edit. Should tell viewers avoid adding material slots, since each slot adds a draw call? How expensive is it to use 2-3 material slots per mesh? Should I bake all of my textures to UV maps instead?**
There is going to be a tradeoff for either solution. Creating custom texture maps for each object will also have an impact on project size and memory in addition to extra time in the creation process.
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uv maps
Makes sense! Thanks for the advice, @endofthehall . 
One way I’ve been “faking” material slots is to create multi-purpose textures with sections that I can zoom in on for different looks. Using UV Unwrap by Polygroup and Transform UVs, I can choose which section of texture to show/hide. For example I created this material for trim like wall molding or dishware edges. Texture sections accomplish a similar goal to UV maps but they’re not tied down to any one particular mesh and can be tweaked on the fly. An idea I had a long time ago that I’ve been meaning to revisit. “Transform UVs” is so fun 
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