Read the documentation for whatever language or tool you are working with. Read the textbooks assigned in computer science university courses if you want to go

Read the documentation for whatever language or tool you are working with. Read the textbooks assigned in computer science university courses if you want to go further. But specific to abstractions, say you have some tool that promises some way to structure your data or allow you to plot a chart or something like that. It's important to know how to do what this tool does the "old fashioned way" without the tool, so you can even vet whether the tool is actually useful or just more cruft you really don't need if you did your due diligence.