The MAIN aspect NOWADAY, for succeeding in Google Ads, is CREATIVITY.
Anyone can create a Google Ads campaign. Anyone can create landing pages.
Why creativity ? In order to achieve the desired results from any Google Ads campaign, CREATIVITY in creating the campaign [ad copies, which keywords to use, etc) and CREATIVITY in creating EFFECTIVE landing page(s), is where the MAIN aspects are.
So, I would suggest adding a lot of greens and veggies into your diet, incase you want to achieve good enough results out of Google Ads campaigns, as greens and veggies are a catalyst for creativity via their nutritional values. While you are creating Google Ads accounts (incase you would churn & burn), I would also suggest lots of cups of strong enough caffeinated coffee.
So, I will sum it up :-
To become a Google Ads "expert", start with eating a lot of greens and veggies, and also have a regular regime of getting used to cups of strong caffeinated coffee.