Most of the databases that you use to look for articles will use Boolean searching, so it's important for you to understand how it works and how the operators function. Interfaces differ between databases, but Boolean searching always works the same way. If you aren't familiar with Boolean searching and you only have 30 seconds, this is the video to watch.
Databases usually default to the basic search. It's important to know how to use it for a quick search, but I suggest using the advanced search feature for research.