I have some code I'd like to reuse in multiple notebooks. Simple definitions, like

ratioFromDb[db_] := 10^(db / 20)

I expect I should put these definitions in their own file, and then somehow include that file in various notebooks. What are the details for this process, please? I have researched this in the documentations, and I've probably already seen the correct answer there, but I'm still not sure about this.

My best guess is, put my library in a regular .nb file, and then invoke the library like this:

Once[Get["myLibrary.nb"]]

Do I have it right? If not, if someone could direct me to the specific page or section in the documentation that covers this, I'd appreciate it. Thank you.