You can win a lot of games against non-titled players with the Stonewall Attack....it's one of the easiest openings to learn. Similar attacking motifs, particularly on the Kingside, can be found in the London System. Of the two, I suggest learning the Stonewall first when a transition to the London System (should you want to) would go more smoothly, as the Stonewall, in addition to being a great precursor to the London, can be played to good effect very shortly after becoming familiar with it's straight-forward attacking themes...
The Stonewall Attack...
https://www.chess.com/blog/RussBell/stonewall-attack
Yaac Attack...is in fact...the Stonewall Attack...
Chill with the Yaac Attack...
https://www.chess.com/blog/LogoCzar/chill-with-the-yaac-attack
Yaac Attack/Stonewall Attack on Chessable...
https://www.chessable.com/chess-openings/s/yaac
Introduction To The London System & Jobava London System...
https://www.chess.com/blog/RussBell/the-london-system
otherwise.....
Chess Openings Resources for Beginners and Beyond...
https://www.chess.com/blog/RussBell/openings-resources-for-beginners-and-beyond
Good Chess Openings Books For Beginners and Beyond...
https://www.chess.com/blog/RussBell/good-chess-openings-books-for-beginners-and-beyond
Scribd and PDFdrive For Online Chess Book Reading, Downloading...
https://www.chess.com/blog/RussBell/scribd-com-for-online-chess-book-reading
several more openings articles here to choose from.....(Italian Game, Vienna Game, etc.)...
https://www.chess.com/blog/RussBell
Start with the Italian. No opening does a better job of teaching basic principles and tactics.