The way registration for Comic-Con works is that some portion of the available badges is put up for purchase as "Returning Registration," meaning that if you attended the last con, you can purchase badges for this one. This sale is then followed by "Open Registration" on another date and on that date, anyone can try to purchase badges. Later on, there may be additional (but limited) opportunities but those two dates are when most of the badges that are going to be sold are sold.
Returning Registration was last Saturday and the anecdotal reports I've heard said that it went smoothly. That is not to say that everyone who wanted badges got them but the ones who got them seem to have gotten them with a minimum of stress and frustration. There will always be those who are unable to score badges because of simply math. The convention center can hold X number of people and the number of people who want to attend is more like ten times X. Or more.
Open Registration takes place Saturday, November 18, 2023 commencing at 9:00 AM Pacific Standard Time. The Virtual Waiting Room opens an hour before that. You can find out more on this page and on this page. Our friends over at The San Diego Comic-Con Unofficial Blog have written up their own unofficial guide that may also be helpful and you can read it here.
I would recommend digesting all this information well before the day, especially the part about having a Member I.D. in advance. I would also recommend keeping in mind that this is basically a lottery and not everyone can win. Until such time as the convention becomes a lot less popular — like, say, when I achieve my Master Plan to someday host all the panels and making sure every one of them is about Groo — there will always be way more people who want to attend than the con can accommodate. Just remember: It's not Real Life. It's Comic-Con, Jake.
And you probably will be able to get into WonderCon — run by the same people but it's smaller. That's at the Anaheim Convention Center from March 29 to March 31 next year. Badges for that will be on-sale soon.