1) introductory books (principles, plans, and ideas) and
2) reference books (for specific variations)
for the following openings...
As White:
-London System ...
https://web.archive.org/web/20140627074459/http://www.chesscafe.com/text/hansen85.pdf
http://www.gambitbooks.com/pdfs/Win_with_the_London_System.pdf
https://www.newinchess.com/Shop/Images/Pdfs/9035.pdf
https://www.newinchess.com/Shop/Images/Pdfs/7619.pdf
https://web.archive.org/web/20140627100246/http://www.chesscafe.com/text/hansen139.pdf
https://web.archive.org/web/20140708093403/http://www.chesscafe.com/text/tips.pdf
https://www.newinchess.com/Shop/Images/Pdfs/7656.pdf
https://www.chess.com/article/view/the-perfect-opening-for-the-lazy-student
and there is also the Cyrus Lakdawala book, First Steps: The Colle and London System.
https://www.chess.com/article/view/how-to-understand-openings
1) introductory books (principles, plans, and ideas) and
2) reference books (for specific variations)
for the following openings...
As White:
-London System
As Black:
-Scandinavian with 3...Qa5
-Baltic Defense
-1 ...e5 against the English
I don't plan on spending much time with these because I am working on tactics and basic endgames (and to a lesser extent, basic strategic and opening principles), but since I have started to play in tournaments a little more regularly (and I am too unskilled to steer the game away from the opening on move 1), I am trying to stick to a simple repertoire that I can learn from after each game online and OTB.
I have Djuric et al's Chess Opening Essentials vol I-IV to get me started.
Thanks!