When is it okay to read the rules?

Hello all. I am new to DnD so just wanted to check in regarding the basic literacy of the group before I devote my next 17 paychecks and most of my adult life pursuing the sweet nat 20 high.

I joined a dnd group and recently got to level 4. My DM (bless his soul) says I get a feet at this level? I said that I already had a couple of them, to which he responded only by licking his lips and grinning salaciously. Do I have to subscribe to his patreon to understand more? I already have a Master tier subscription to DnD Beyond but haven't bought any of the books yet. I am a level 3 Fighter/Level 1 Blood Hunter btw, don't know if that makes things any different. I thought about looking online, but my DM got really mad at me and accused me of metagaming. What do I do?

/uj no shade to OP i think it's a very sweet post, but the title alone made me laugh pretty hard. Sorry OP if you find this https://www.reddit.com/r/DnD/s/HZB7m8TpLc