Relearning the game.

[Sharmon's farm]

I haven't played in years, I am just getting started on my old character. I am on a PC. I am looking for the actual keys to use to make cheese, mayo, wine, cloth..

 

[Ereo]

On PC, is C or X, unless you changed the keys.
The wiki has a section about the controls: https://stardewvalleywiki.com/Controls

you can change them in the options menu.