If you use resources, such as IRS pubs and Tax Topics, you learn from them. I also like consumer-level articles that are from trusted sources, such as investopedia, because they are written not in IRS-speak, but natural language. Cornell is another good resource for searching a specific code section. The Tax Book is nice, too; they have client handouts, as does the CFPB. My State has a financial extension office (like an ag extension office) that has amazing resources and offers web updates: https://www.montana.edu/extensionecon/publications.html . Your own State likely has a CPA professional licensing organization that does this, too. That's because you want to take CPE and other update classes.