which opening is easy for beginners to learn?

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I would not spend to much time learning opening theory. Just put pawns in the middle of the board develop your nights and bishops get castled then connect your rocks. This is the same for pretty much any opening and its important to know why you make the moves you do.

If you ask people for specific opening recommendation they are just going to give you there taste. The easy opining to learn it the one that you understand so you don't have to memorize all the moves because you know the ideas.

For example the London, Torre, and Colle systems might be easier to learn if you understand the ideas behind putting the pawns on c3 and e3. and this might help you understand the semi-slave as it has a similar pawn structure.

Nonsense.

London system would definitely be the easiest if you're playing white. This is mainly due to its robotic nature, you just need to memorize the positions, and bam, you've got it. It does, however, piss off quite a few advanced players, but to hell with those dudes.

At your level, stick with opening principles.  Openings do not decide your games.

Just plain BAD advice.

Chess Opening Recommendations…

You might give the Vienna Game & Gambit a try. After 1.e4 e5, by introducing 2.Nc3 prior to 3.f4 it is considered an improved version of the King's Gambit. The point being to first establish increased control of the center by protecting e4 and adding a second defender of the central square d5. All of this in anticipation of initiating an attack on the kingside beginning with the move 3.f4. The opening is very popular at the amateur level, and playable even by advanced players..
https://www.chess.com/blog/RussBell/introduction-to-the-vienna-game-gambit
https://www.youtube.com/watch?v=JVxENCPcCjU

For beginner-intermediate players I also suggest to check out GothamChess (IM Levy Rozman) on YouTube for recommendations and quick tutorials on openings....
https://www.youtube.com/watch?v=NFod-ozimmM
https://www.youtube.com/watch?v=Qdyik5UwBtM
https://www.youtube.com/results?search_query=gothamchess+openings

For more opening suggestions check out the chess openings tier lists videos by GM Hikaru Nakamura and IM Levy Rozman...
https://www.youtube.com/results?search_query=chess+opening+tier+list
In the tier lists chess openings are categorized and rated in terms of their appropriateness vis-a-vis player skill level - i.e., beginner vs intermediate vs GM’s, etc. Note that in some of the videos (particularly the one for beginner openings) they frequently refer to some openings as "garbage" or "bad" (an unfortunate choice of terms). However, these qualifiers are meant to convey how appropriate the specific opening is for the level of player being discussed, in terms of, for example, how much so-called "theory" (i.e., documented variations) the opening encompasses, or how much emphasis the opening places on positional versus tactical skills in order to play it well.
So, an opening they refer to as "garbage" for a beginner may in fact be appropriate for higher rated players who typically know more of the theory for particular openings and have a more highly developed understanding of positional concepts. For each of the openings discussed be sure, also, to pay attention to whether the evaluation is from White’s or Black’s perspective.

Finally, several articles on suggested openings and other chess topics that may be of interest to the improving chess amateur in my blog....
https://www.chess.com/blog/RussBell

I would say most gambits are easy to learn, but due to their nature can lead to very tactical games... which might not suit many beginners.

Italian imo is the easiest opening for beginners to learn. They can keep the position closed and positional with c3 + d3 and learn how to make progress with their pawn play in those type of positions, or they can open the center with c3 + d4 or d4 immediately and try to get good piece activity. But I think the most appealing aspect to it for beginners is that they can develop their entire kingside by move 5, so it practices good development and gets king safety very early

I would actually disagree with the London being a beginner's opening. There are very specific move orders you need to adhere to and the attacking motifs in the London aren't exactly easy for beginners to play out 

The danish gambit is a difficult opening to play with since a mistake on either side of the board can lead to devastating consquences. It's unforgiving and there needs to be in-depth analyses on whether or not white accepts the gambit/declines, and how black organizes an attack.

As a beginner I have tried the London, the  problem I had was my beginner opponents doing unpredictable things that often disrupted my move order and messed me up, meaning I was not able to adapt well to the specific situation.

This advice is gangsta until white plays f3 and then g4 for Barnes Opening Theory lol

I just learned how the horsey-thing moves but I think I'll provide some input here.

I recommend a Caro-Kann for Black; there's only 3-4 systems to really internalize and it really enhances your positional understanding of chess. My issue with 1. e5 for Black is that there's so much opening theory with the Italian Game, Ruy Lopez, etc. and it overcomplicates things for beginners. The Caro-Kann is very solid.

I would recommend learning the kings indian set up... You can play it with both white and black and it should get you 1000+

Jw089 I hope I don't make this sound complicated 😂... Focus on your king side peace's For white: Knight to F3 Pawn to F3 Bishop to G2 Castle king side For black: Knight to F6 Pawn to G6 Bishop to G7 Castle king side After this look to push with your E or C pawns... IMPORTANT NOTE!!! If the other player pushes there kings pawn make sure to stop and move your queen pawn to either D3 or D6... trust me...

Sorry white pawn to F3 not F3.... You can message me if you're interested in playing...