Good Openings for a 300-600

I want to learn some openings. but which ones should I learn?

Italian Game

London system.

Some people think that you should only learn openings after 800, I disagree so here is my advice:

For white: Scotch or Queen’s gambit

For black: French defense or just play d4, d5 or e4, e5 and following the opening your opponent chooses

hii hello guys ji

so far i've learned the London System and the Italian.
oh and i already knew Scholar's Mate. 
i need to learn Scotch, Queens Gambit, French defense and Owen's Defense

Try the stonewall or london.

Ponziani

Pg3 Bg2 Nh3

At true beginner level, probably the Italian for White. It's fairly straighforward and is highly principled in terms of classical opening development.

Supported pawn in the centre, Knights & bishops to active squares, castle KS early and so on.

For Black I suppose against 1.d4 the QGD for much the same reasons, and against 1.e4 ...e5 makes more sense than trying to (mis)play the Sicilian because higher rateds always seem to play it.

Italian life and tree horses opening!

Play the Italian and the Fried Liver Attack, but if you prefer 1.d4... try the London System or the Queen Gambit. For black I recommend against 1.e4 the Caro-Kann and for 1.d4 the Dutch because it's a System and you can play against any move of your opponent

Don’t learn openings, learn tactics. Setup based openings that you can play against anything or ones with simple ideas that you understand are great. Most of all just follow opening principles. You don’t need an opening repertoire, you need basic understanding of tactics and endgames.

Learn how to play all of the Classical 1.e4e5 openings, play about 50+ games of each at the 5/0 or 10/0 time control, then choose the one that appeals to you the most. Stick with that opening for at least a year. Do the same with the classical defenses.

I agree about tactics to some extent.

A beginner must first need to understand the basic opening principles - which you also mention - from which opening/early middlegame tactics may flow:

• Open with a centre pawn.
• Try to maintain a pawn in the centre.
• Try not to make more than 3 pawn moves in the first 10 or so moves.
• Always look to develop pieces, preferably aiming to cover the 4 central squares - playing to control the centre.
• Develop with threats when possible.
• Don't move the same piece twice unless absolutely necessary, or it gives you a clear advantage.
• Don't bring your Queen out early.
• Castle as soon as you can, preferably on the Kingside.
• Don't sacrifice without clear compensation.