A recommended opening

Since when was the Catalan a second tier opening for grandmasters lol

lol

that is funny

For white I highly recommend the Vienna, you can watch some good videos of Gotham Chess on Youtube about it.

What defines a 1st tier and 2nd tier opening anyway? (Plus the catalan's great at all levels)

As the Ruy (with a "u") Lopez is the only opening that I know and it parallels the beginner opening goals of fast development and castling, that's the one that I use if possible.

I find the italian opening good as I like to play the Evans Gambit when I get a chance (as black or white) - always a sharp game!

As white in the Evans you get to develop and castle quickly and plenty of attacking chances. Never a long game and always fun. As black you get a pawn up straight away and plenty of chance for counterplay. 

I know several strong grandmasters who say that the Italian is an opening that is played when the goal is to avoid studying.

The Italian is great at literally all levels for a reason

Because nobody likes to study anymore?

one time I heard a grandmaster doing a video say that doing gambits is good because it tells you how to develop

the ruy Lopez is good if you do like outplaying your opponent instead of trying to attack right away

Semi-Slav is great. I love learning the Botvinnik Variation which is a very sharp and theoretical opening which is a lot of fun to play. Just wish more people played into one from both sides

Bingo

Is English opening good for beginners ... I am actually 800 elo rated player and english has helped me a lot in chess.....Should I continue with english or change my opening????
Thank you 

Choose the opening that suits your style!

Any suggestions?? I mean if you were me.... would consider playing  English?

(That is a lot of "wrote"!) Anyways, on the Lichess.org database, the English seems to score pretty well for white. (I may seem like a noob on chess.com with my ratings, but my lichess.org account is much better. Hikaru99 for reference)

Try it out and see if you like it. If you don't like it try something else. I used to play Italian but then I switched over to d4-Queen's Gambit which I like a lot which you can study here. The best thing is to experiment around and find something you like and stick with it. Just make sure it's sound so that you can improve with a good opening (ex: Ruy Lopez, Italian, Open Sicilian, Queen's Gambit, etc) not (Stafford Gambit, Damiano's Defense, O'Sullivan etc.) 

You can also transpose a position if you want if you want to have a backup repetoire. For example, I play the French, but when someone plays 2.Nf3 or 2.Nc3, I play 2...c5 in to a Sicilian to avoid exchange French. But every opening is different so find what suits you.

I think the italian is way better than the Ruy Lopez for a beginner, it's like the Ruy Lopez, but the white bishop goes on c4