I have bits and pieces of things from very early, but can't place them. Like the layout of old apartments my family lived in, recognizing things that I haven't seen since around age 2. But I was 3 or 4 by the time I started remembering actual events or things I can give you a play-by-play about. I remember stealing a canister of Bubble Tape from my cousin and hiding under a kitchen table telling my mom "wasn't me" while chewing a mouthful of gum.
I started preschool very early and remember things that we did in the classroom. There was a jar with a potato growing in it. I remember the whole room was concrete and very dungeon-esque, and every few weeks we'd have some kind of meeting where people would come in and try to sell us things. Little plastic toys and stuff. I was just around 3 then.
When you start talking very earliest, it's hard to say for sure, because there are a lot of gaps where my mind fills in the blanks. I remember things like staring at walls and doorways, seeing people walk in and out of rooms without being able to move, but I don't know if those are actually memories from before I learned to crawl or if they are things my mind has invented since then.
There were things I used to think for sure I remembered, but turned out to be partly or even wholly made up based on partial information. There was a fight I had with a friend around the time I was 3, and for years I remembered it as him climbing into a toy car I had and stabbing me with a fork. It wasn't until I was 13 or 14 I brought it up with my mom and she showed me video evidence proving I was the fork-stabber.