Easy to learn and practice openings for black

I'm a casual player and stuck at 1400. Only other opening I know is London System for white. I have watched videos etc for black openings and understand them well. But since I do not know how to practice openings, I forget them soon after. White London opening was easy to learn since its a set-up based opening and you only need to learn where to put pieces irrespective of black moves (with exceptional edge cases). I can't find similar for black.

So, please suggest some simple openings for black which are easy to learn and some online tools where I can practice openings. Thank you.

You can practice openings at chesstempo.com.

Nothing is "Easy" In Chess or Life ... Study Complete Games ... Maybe what you're looking for is a version of Phillidor's Defence called by "Modern" Players "The Lion" OR something similar in Pawn structure to what you play now' which would be ... The Semi-Slav or Slav with Black vs d4 & The Caro-Kann against 1e4 @Crow_Eye Study Play Play Study & You will get there ... wherever there is for you . I would still reccomend Chess books & Videos but on Complete Games with Endings & Middlegames Involved

I still don't have something I love against d4, but I play the Caro-Kann against e4 because I don't really like studying openings and I think it's relatively easy to learn the basic themes. I hated playing against the advance variation though, because I didn't like learning all the theory after 3. ...Bf5, so I learned the Botvinnik-Carls defense, which I think is easier to play. If you want to give it a shot, I made a study about it a while ago, with some simple ways to get a playable position without too much memorization.

For many, a good starting point (for openings) would be:
"... For beginning players, [the book, Discovering Chess Openings by GM Emms,] will offer an opportunity to start out on the right foot and really get a feel for what is happening on the board. ..." - FM Carsten Hansen (2006)
web.archive.org/web/20140627114655/https://www.chesscafe.com/text/hansen91.pdf
www.amazon.com/Discovering-Chess-Openings-Building-Principles/dp/1857444191?asin=1857444191&revisionId=&format=4&depth=1
Some of us think that it can be useful to use books like First Steps: 1 e4 e5 and Logical Chess as sources of games with explanations intended for those just starting to learn about an opening.
“... [First Steps: 1 e4 e5] is a fun and informative book. ...” (2018)
chesscafe.com/book-reviews/first-steps-1-e4-e5-by-john-emms/
www.newinchess.com/media/wysiwyg/product_pdf/7790.pdf
"... Logical Chess [(Batsford edition by Chernev)] ... a collection of 33 games ... is definitely for beginners and players who are just starting to learn about development, weak squares, the centre, standard attacking ideas, and the like. In many ways, it would [be] a wonderful 'first' book (or first 'serious' book, after the ones which teach the rules and elementary mates, for example), and a nice gift for a young player just taking up chess. ..." - IM John Watson (1999)
theweekinchess.com/john-watson-reviews/assorted-recent-books
www.amazon.com/Logical-Chess-Every-Explained-Algebraic/dp/0713484640?asin=0713484640&revisionId=&format=4&depth=1
www.google.com/books/edition/Logical_Chess/Q5ZdDwAAQBAJ?hl=en&gbpv=1&pg=PA2&printsec=frontcover
www.chess.com/forum/view/game-analysis/logical-chess-move-by-move-1