What is your best ONE TIP OF ADVICE for Beginners/Intermediate

Remove emotions when you play. For example, if a move looks hard to calculate and looks “scary,” but it is best, play it.

Analyze every game you play, to search for improvements. Every single one. No exceptions.

entering a losing position on move 1 like the englund gambit does is bad at every level. It's not hard to play against it even as a beginner

Checks, captures, and consolidation.

I'm hardly beyond a beginner myself but a few of things I learned in the early days of playing chess....

1 - Be very cautious about putting the other king in check. Don't just assume that your opponent will simply move the king to the side....they may be able to not only block it with a piece but attack you back (e.g. blocking and attacking your queen back with a bishop). Before any act of aggression against the king, work out their most logical way of defending the attack and what risks that might create for you.

2- When the opponent gets a knight into your half of the board, pay attention! Don't make a single move until you've checked out all the possible places the knight may call home on the next move or even a move after that (referring back to an earlier comment about knights in the midfield and forks - really can't be emphasised enough).

3 - Pay attention to what your board will look like after pawn recaptures - your opponent may offer what looks like a tempting trade that actually completely wrecks your kings defences or isolates a pawn. Sometimes an even trade has hidden advantages for the opponent.

If you look back over my past losses you'll find I still messed up on every single one of these points recently, still learning the hard way... 

Just realised the OP said ONE piece of advice so I suppose I'd add the following:

4 - Pay attention to details.

I suppose you don't understand that I was also a beginner once. Hopeful tricks don't work at that level (your level) either. 

One piece of advice since that's the limit set, make sure your pieces are connected and not too scattered as this will ensure defense.

One tip= have a process (start with a plan to build/create one) and continually improve it

Beginners-

Start with the 3 principles given in earlier posts...

Center control/Development/King Safety

Intermediate- add to that...

Material & Pawn structure

If you view these as objectives rather than principles, you'll feel the need to accomplish certain things for reasons.

I'm not sure where intermediate ends and advanced begins...so:

Eventually, you'll see it necessary to "measure" these things and by calculating threats/moves (tactics) and evaluating resulting positions...come up with candidate moves and plans/ideas for the opening/middle game/endgame.

Starting with endgames (imo) helps you start to recognize patterns and understand the importance of it as one of several needed skills.

Post of the day.

So, which one?

Checks, captures, or consolidation 

Be greedy.

Do you best to not lose any piece for free. Not even a single pawn.

Do your best to check whether your opponent's last move gave away something for free.

Why doesn't your rating indicate that you're 1300 then? if you were actually 1300, you'd be 1300

playing lots of unrated games doesn't change the fact that your rating isn't 1300, given that unrated games are exactly that: unrated. 

and I could adopt you, so what's your point?

u probably couldn't 

@parkerkorb sorry about your thread

A tip: Watch Gotham chess videos. He has rlly good videos 

I mean, you did say you could adopt him...he said you're 700...sounds like a good way to settle your dispute