I just started mtg the other day, honestly don't have a clue about the cards or anything, but the quick game mode (bo1?) were pretty fun even with basic decks...I did get a few of tgose mythic cards already (mythic rare or whatever it's called), so I'll try and build something of my own soon...
If someone could, please is there something like a tutorial for beginners, what to buy/craft, how many wildcards can I have at one time and general advice for someone who basically never played magic...I am regularly legend in HS so I can grasp the game concepts pretty easily probably, but these other things I don't wanna screw up (although I'm gonna play mtg super casual, HS is better for me, as people said, you can play for 5 minutes or for 5 hours, far more accesible than mtg in that regard)
Most MTGA people would tell you not to buy packs with gold but rather to save up and play quick draft because you will increase your collection faster than with buying packs.
What to craft is entirely dependent on your deck preferences. Some people recommend to craft a fast deck (mono-red or mono-blue) and do dailies with it, while you slowly build your Tier 1 deck.
How many wildcards can you have? AFAIK there is no limit.
General advice? When you draft, it is ok if you pick a card that has no synergy in your drafted deck but you need in your collection; a good card that you can choose is often more valuable than a pack full with cards that are useless to you.