Suggestions for a good next opening to try

Hi folks,

I am an 1100 rated player recently trying out the London system when white and French defence when black looking to increase my repertoire.

Any suggestions for a next step, straightforward, easily memorised openings to try please?

Glenn.

Now start learning the classical Queen's Pawn Openings.... start with d4 and c4

I read a piece of advice once that every player should spend a year playing open games. So open with 1.e4, perhaps intending the Italian Game or the Four Knights, and meet 1.e4 with 1.e5. Scotch Four Knights is an easy system to learn.

Why is that? 

In my opinion you  should stick with the openings you have already learned and learn them better.

And  you should not just memorize more than just the first few moves of an opening. You should learn to understand the opening.

And you should also learn the mistakes you are making in the 2 openings you already have started to learn.

[and besides -- you need to learn the endgames and also tactics rather than adding openings in your learning process]

"... Overall, I would advise most players to stick to a fairly limited range of openings, and not to worry about learning too much by heart. ..." - FM Steve Giddins (2008)

Possibly of interest:
Simple Attacking Plans by Fred Wilson (2012)https://web.archive.org/web/20140708090402/http://www.chesscafe.com/text/review874.pdf
http://dev.jeremysilman.com/shop/pc/Simple-Attacking-Plans-77p3731.htm
Logical Chess: Move by Move by Irving Chernev (1957)
https://web.archive.org/web/20140708104437/http://www.chesscafe.com/text/logichess.pdf
The Most Instructive Games of Chess Ever Played by Irving Chernev (1965)
https://chessbookreviews.wordpress.com/tag/most-instructive-games-of-chess-ever-played/
Winning Chess by Irving Chernev and Fred Reinfeld (1948)
https://web.archive.org/web/20140708093415/http://www.chesscafe.com/text/review919.pdf
Back to Basics: Tactics by Dan Heisman (2007)
https://web.archive.org/web/20140708233537/http://www.chesscafe.com/text/review585.pdf
https://www.chess.com/article/view/book-review-back-to-basics-tactics
Discovering Chess Openings by GM John Emms (2006)
https://web.archive.org/web/20140627114655/http://www.chesscafe.com/text/hansen91.pdf
Openings for Amateurs by Pete Tamburro (2014)
http://kenilworthian.blogspot.com/2014/05/review-of-pete-tamburros-openings-for.html
https://chessbookreviews.wordpress.com/tag/openings-for-amateurs/
https://www.mongoosepress.com/catalog/excerpts/openings_amateurs.pdf
Chess Endgames for Kids by Karsten Müller (2015)
https://chessbookreviews.wordpress.com/tag/chess-endgames-for-kids/
http://www.gambitbooks.com/pdfs/Chess_Endgames_for_Kids.pdf
A Guide to Chess Improvement by Dan Heisman (2010)
https://web.archive.org/web/20140708105628/http://www.chesscafe.com/text/review781.pdf
Studying Chess Made Easy by Andrew Soltis (2009)
https://web.archive.org/web/20140708090448/http://www.chesscafe.com/text/review750.pdf
Seirawan stuff:
http://seagaard.dk/review/eng/bo_beginner/ev_winning_chess.asp?KATID=BO&ID=BO-Beginner
http://www.nystar.com/tamarkin/review1.htm
https://web.archive.org/web/20140627132508/http://www.chesscafe.com/text/hansen173.pdf
https://www.chess.com/article/view/book-review-winning-chess-endings
https://web.archive.org/web/20140708092617/http://www.chesscafe.com/text/review560.pdf

First Steps: The Queen's Gambit
https://www.newinchess.com/media/wysiwyg/product_pdf/7652.pdf
The Queen's Gambit Declined: Move by Move
https://www.newinchess.com/media/wysiwyg/product_pdf/7743.pdf

Folks,

Really good response, my thanks to all. I certainly take the point of refining my understanding of the openings I know. I have been watching chess.com videos (great resource BTW) , practising against live opponents and the chess engine to try to properly understand as many variations of my openings as I can. So sound advice. II am also attempting to spend at least ten minutes a day on the tactics trainer which has really helped. Although by no means immune from them, I feel it has helped me make fewer silly mistakes than I used to. 

I hadn't expected the reading list but appreciate the effort kindaspongey put into his/her reply. I scanned two Queen's gambit pdfs over lunch today and plan to have a proper read at the weekend when I get a bit more time (day job is engineer). Ponz11 - I like the idea of not memorizing too much, the memory isn't what it was.

Really appreciate everyone taking the time to share their thoughts and suggestions. Plenty for me to get my teeth into. Thanks again.

Glenn. 

 illusmte, because the open games encourage produce tactical positions that give you a good grasp of the power of pieces. When you've mastered that you can move on to more strategic closed positions.

Maybe..... 

The problem with this sort of advice is that there is no masters diploma for grasping the power of pieces. As far as I can tell, one gradually improves.

Italien game