What is the easiest gambit?

Yes. Yes they do. At every level. You just get better at exploiting them. Or they matter more when less pieces are hung.

If you are a proper beginner then I would argue that Learning "Gambits" and "Openings" is not all that important.

It is way more useful to learn opening PRINCIPLES. This is the advice that I saw on Gothamchess & Pegasus Chess and a few other chess channels on Youtube.

I've got myself up to over 1,000 ELO on daily games and I'm pretty confident I'll be over 1,000 in rapid by the end of the year.

I'm not saying that makes me a good player (before anyone starts LOL!) but this is a thread for "beginners" not people who are experts and can barely remember what it's like to be a novice.

I'm speaking as someone who's gone from 300-400 in January, when I started getting properly in to chess, to 1,000 in July. I know how I did that.

I can honestly tell you that I don't know what the Queens gambit is (other than a TV show) or any other gambit, I don't know what the 'sicilaln' 'Caro Kahn' 'London' etc..... are. I've heard of them but I honestly don't know anything about them and yet I'm at over 1,000 ELO.

I realise that I am now approaching a level where I probably will now have to start learning these things if I want to improve any further BUT honestly if you are genuinely a beginner then just forget all the "How to win in 3 moves" & "What is the best opening" stuff and just concentrate on the basics.

1. Learn opening principles

2. Learn CCAT (Checks, Captures, Attacks, Threats)

3. Analyse your games

4. Do chess puzzles

5. Find some chess videos. I know he's not to everyone's tastes but Gotham chess does have an excellent YouTube video series for 0-500 ELO players that is well worth watching.

I'd do all of that before learning what is the best gambit and suchlike

Super solid advice. I cannot agree enough with this. Fundamentals are peak, and once you get those it really doesnt matter what opening you play. 
And as for "people that can barely remember what its like..." I teach full time. I do know what its like to be a beginner. I do remember. I frequently work with people rated under 1k, and even in the 1k-2k ranges for lessons. I also work with colleagues at different ratings above my own. Its quite literally my job to know the mindset of someone who is a beginner, and dont get me wrong Im not perfect about it. But I do make sure to improve on it every chance I get. 
Congrats on your improvements btw, and you gave really solid advice. I wish you only the best in your chess career.

Thanks!

Just to clarify, I wasn't referring to folk who actually coach/teach chess. I was just meaning a lot of people in comments sections (on a whole range of disciplines) forget what it's like being a newbie.

Kings Gambit

"Pretty much every game" = One game in a hundred. Maybe even less.

The other 99 games are determined by the middlegame or the endgame.

QUEENS GAMBIT

See I'll tell you I'm not too bad I'm like beating the Maria bot level.

Retiiiiiii