To paint over ceramic tile walls:
Hello, not sure exactly what room you’re talking about whether it’s floor tile bathroom tile or kitchen backsplash. Here is in my saved links about painting tile hopefully this might help.
Paint and stencil
How to Paint DIY Stencil Tile Floors | Hometalk
How to DIY: Stencil Paint a Ceramic Tile Floor the Cheap and Easy Way | Hometalk
I always use that kit from Amazon https://amzn.to/2HapOpz
Here's an alternative to painting over ugly tile: https://thehoneycombhome.com/floor-stickers-in-the-bathroom/