I have been working on a commentary on the Psalms. I have decided to compile some helpful links that I discovered during my research. It includes a mix of exegetical and sermonic links. Here is what I have for Psalm 20 (in no particular order). Feel free to mention any that you find helpful in the comments section.
Spokane Bible Church: http://www.spokanebiblechurch.com/books/psalm-20
Literary analysis of Psalm 20: http://psalmsstudy.com/psalms-literary-analysis-by-chapter/literary-analysis-psalm-20
Ray Stedman., “Best Wishes for the New Year,” Psalm 20: https://www.raystedman.org/old-testament/psalms/best-wishes-for-the-new-year
Analysis by C. J. Labuschagne: https://www.labuschagne.nl/ps020.pdf William Barrick’s notes: https://drbarrick.org/files/studynotes/Psalms/Ps_020.pdf