Whether you're an experienced radio amateur or a newly-licensed operator, we call all use a basic refresher on the theory and practice of antennas.
In this video from Jim Reed (N4BFR), we get an easily understood discussion of HF antennas suitable for all classes of amateur radio licenses.
Among the antennas described are basic verticals, dipoles, end-fed wires, and ham sticks. Jim does an excellent job of making complex ideas simple and knowable.
If you can't see the video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=eONL1ntJ3-c.