How to look at how other mods have implemented things and learn from them.
These tutorials and guides are only capable of covering so much. If you want to become a real modder you will have to learn how to inspect other mods and the base game's files to implement your ideas.
Core Keeper mods are compiled at runtime, so you can simply open a mod's files to view contained C# code. Download the mod from the mod.io website, open the zip file, and check out the Scripts directory. Or directly open the mod's directory on disk.
A number of mods have their sources posted on GitHub. Example: CoreLib. It's up to the individual mod developer to somehow provide links to their repositories, as mod.io does not have a "field" for communicating it.