1 The scientific method
The scientific method is an approach by which robust knowledge is acquired. The approach can be applied to diverse situations, not only science.
You probably learned about the scientific method in the third or fourth grade, but I like to refresh the general concepts as I commonly see students formulating experiments for which there is not clear question, doing analyzes whose results will not answer the question, etc.
Knowing the exact protocol of how to go from question to answer will avoid you wasting time into what I call rabbit holes; basically, a lot of effort put into work that does not help the ultimate goal you proposedd.