Tile requiresthinset mortarormasticto adhere the tile to the wall.
Both can be a bit messy and tricky to smooth out.
Instead, try a tile setting mat.
A tile setting mat is like double-sided tape.
Just cut it to the desired height and length and apply it to the wall.
Then remove the backing and press your tile firmly into it.
Unlike thinset, which needs to dry overnight, you might immediately grout the tile and then clean up.
Heres anotherstep-by-stepusing Mussel Bound to install a marble tile backsplash.
How to Install a Glass Tile Backsplash| This Old House (YouTube)