Even though I'm aware of this specific rule, sometimes I get titling wrong, which is why I always go here:

https://titlecaseconverter.com/

It titles stuff for you based on the stylebook you choose:

AMA, AP, APA,Bluebook, Chicago (Manual of Style), MLA, NY Times, Wikipedia

It also includes an explanation if you hover your mouse over each word in the converted title. That way, it becomes a learning tool, as well.