fried liver/traxler

Both are Garbage!  They are nothing more than trick lines that any 1400 or higher player OUGHT to know.  It is not worth taking the risk that they will fall for something stupid.  White is clearly better in the Traxler.  Black has full equality at move 5 against 4.Ng5.

1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5?! (4.d4 and 4.d3 are both stronger) d5! (4...Bc5? 5.Bxf7+ followed by 6.Bd5 +-) 5.exd5 Na5!! (Black has already achieved full equality - 5...Nxd5? is a sucker move and just what White is hoping for!)

If you play the normal Italian or Evan's Gambit against 3...Bc5, play 4.d4 against the Two Knights.  If you play the Slow Italian (d3 lines), then play 4.d3 against the Two Knights Defense.

Play them.  Learn them.  Especially if you enjoy playing them.  At your level it is very important to first learn how to play attacking chess, chess with lots of tactics.  Once you feel confident in your attacking skills, you can then begin to learn some more "solid" openings.

WIN IN 8 MOVES | The Fried Liver Attack - GothamChess

https://www.youtube.com/watch?v=hLFSufXxtuI

Fried Liver Attack | Chess Openings - Chess.com

https://www.youtube.com/watch?v=VVI1nHnP5Zg

WIN IN 7 MOVES | Traxler Counter-Attack - GothamChess

https://www.youtube.com/watch?v=v1jkj-HPLdw

More...(particularly) the first 3-5 videos listed)...

https://www.youtube.com/results?search_query=fried+liver+attack

https://www.youtube.com/results?search_query=traxler+counter+attack

check out my blog article Introduction to The Italian Game & Evans Gambit (a "solid" opening system) here...

https://www.chess.com/blog/RussBell

Obviously, I strongly disagree with those who proclaim these openings to be "garbage".  In my view it is simply arrogant to say such things to beginning chess players.  I stand by my recommendation.  Once you reach a rating of 1500 Elo or so, you can then reassess your choice of openings, if you so choose.  Until then, learn and focus primarily on openings where the emphasis is on attacking chess.  Note that the Italian Game can be played in a variety of styles, from very tactical, aggressive and sharp, to positional and maneuvering.

Other Chess Opening Recommendations

You might give the Vienna Game & Gambit a try.  This opening is an aggressive, attacking opening which is very popular at the amateur level, and playable even by advanced players.  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. 
https://www.chess.com/blog/RussBell/introduction-to-the-vienna-game-gambit
https://www.youtube.com/watch?v=JVxENCPcCjU

I also suggest to check out my blog article Fighting the Sicilian With The Grand Prix Attack. 

https://www.chess.com/blog/RussBell/fighting-the-sicilian-with-the-grand-prix-attack

As the title says, this is an opening for White against the Sicilian Defense (1.e4 c5).  In particular you will notice that White's first several moves in the Grand Prix Attack are the same as for the Vienna Game & Gambit (1.e4 / 2.Nc3, followed soon thereafter by f4).   While the openings are different by virtue of Black's first move, because White's first few moves are typically the same in both openings, there is some commonality not only in the setup but also in the fact that in both openings White's intention is to launch a kingside attack against Black, which is the point of the aggressive placement of the f4 pawn. 

In fact, because of these similarities  what one learns in terms of tactics and strategies from one opening may sometimes prove useful for the other opening as well.  At least this is my view, and why I chose to create blog articles on these two openings.

For beginner-intermediate players I also suggest to check out GothamChess (IM Levy Rozman) on YouTube for recommendations and quick tutorials on other openings....
https://www.youtube.com/watch?v=NFod-ozimmM&t=103s
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.....particularly their 3-part videos Tier List for Beginners...
https://www.youtube.com/results?search_query=chess+opening+tier+list

In the tier lists videos 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 will frequently refer to some openings as "garbage" or "bad" (an unfortunate choice of terms in my view).  However, these qualifiers are meant simply 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 articles on chess topics that may be of interest to the improving chess amateur in my blog....
https://www.chess.com/blog/RussBell

you can play 4 ng5. i would not bet on getting the nxd5 line from black though. the main line 4 ng5 sees white win a pawn but black has compensation and also his play is much more natural so in a practical game i would favor black. you have to be really well-prepared as white if you want to delve into the lines where white holds on to the pawn.

4 d4 leads to a different kind of position entirely. it's still a complicated position but here you have the chance to seize the initiative in the main lines. still requires some homework if you're up to it.

4 d3 is the positional main line. it's probably best in terms of avoiding direct preparation as you can play in many different ways without forcing anything too early. the kind of maneuvering you see from the closed ruy lopez also exists here.

If it's quite complex and tricky for black with no counterpoints then it's objectively better for white. 

What else does being better for white mean? It doesn't mean forced win, it means white is going to have an easier time. 

According to the lichess database no top player in the history of chess has played into the Fried Liver in a competitive game.   

Always play h6  when white's knight comes out and then no more Fried Liver Attack.