If you are in the USA the main "programming language" as such is called "ladder logic" it is sort of like a combination of electrical drawings and boolean logic.
This site has a good tutorial. https://www.plcfiddle.com/
In other locales, they may lean more on something called "structured text"
The languages are supposed to be standardized, but much like old browser HTML support, each major company's implementation may differ by a little, but once you get the basics you should be fine.