I agree with the first two but not the third one.
The three fastest ways for a beginner to improve!

I agree 100%.
You can learn 20 moves of opening theory and strategically suffocate your opponent to death like Karpov, but if you keep hanging your queen every game, you'll never get past 1000 rating.
Simple tactics are what decide the game for beginners. Whoever hangs less pieces wins.

I strongly suggest all beginners watch this video. It gives helpful advice on how to reach 1000 rating, from an International Master:
https://www.youtube.com/watch?v=U2huVf1l4UE&t=744s
He effectively says the same thing that I just said: your rating will never improve until you learn to stop hanging pieces.
1. Practice tactics.
2. Practice tactics.
3. Practice tactics.