I'm playing 2 hours every day and have worked my way up from absolute newbie to almost an advanced level. Based on the USA Pickleball Association's Definition of Player Skill Ratings, I'm somewhere between 3.5 - 4.0, so call it 3.7. This is based on my own interpretation of my skills.
Yes, I was playing through the winter with temperatures hovering near +10 deg F.
The complete rules and everything you need to know is on the official pickleball site: USA Pickleball Association
When I first started playing, it took me a few weeks to understand the scoring. Now, it makes sense.
What I find amusing is that no one can remember their score. At the beginner level, OK. At the advanced level, we still can't remember it. Perhaps the experienced members can remember it better, but we still lose track.

I still can't get over how many people playing pickleball with knee, hip, or other joint problems. Lots of players are wearing knee braces. I introduce myself and describe my knee problem. They then say "I had one (or both) knees replaced", "Got my hip replaced", or some other combination. I felt like a newbie and stopped complaining about "only" one slightly mucked up knee.
Is this a limitation? Not by any stretch of the imagination. I get beat by players in their 70s (and one guy in his 80s). Male or female, it doesn't matter.
I also see tennis players playing pickleball because their doctor said they couldn't play tennis any more. So, they play pickleball instead.
This is the only sport where you feel good when you lose. There's lots of social interaction which makes this game even more fun to play.
I see pickleball mentioned quite a bit in this forum (including me). So, what's everyone doing?