If you start from scratch and you are willing to play it IRL, avoid playing online, it gives you bad habits due to heavy automation.
Best is learning by playing with IRL cards, you can rely on MTGA just to check if you're doing things right.
I spent some money because i wanted to play IRL. I got the 2 commander decks and 2 standard decks.
Tidus Commander Deck
Duskmourn House of Horror
Final Fantasy Starter Kit
The Main reason I got standard decks was due to one of my irl friends not liking commander. So I wanted to be able to play with him and have him teach me the standard version of the game.
The Commander Decks are for my Local Card shop they have casual nights and said that alot of people learn that way.