An aspect of learning about the concepts that underlie TeX and LaTeX is learning how to apply terms correctly that are TeX jargon.
Is it on topic to ask about how to apply terms of TeX jargon or about their meaning on the main site?
Here's an example of a question about TeX jargon (using TeX jargon/terminology for naming things in TeX correctly):
Is the delimiter of a delimited argument to be considered a component of that argument?