HI Sid,
It’s pretty easy to make a Mask and use that in the Shader Editor, but be aware that, if you want the letters ‘indented’ in the keys,you’ll need to use a Displacement and that needs a lot of Geometry, in order to look good. Here’s a simple example with not enough Geometry (I added the Wireframe, so you can get a better ideas of the amount you’d be needing):

You’ll get a much better result by using Booleans, as demonstrated in the above mentioned Laptop Course.