What are the visa requirements and restrictions for visiting Thailand from China for a few months?

So bear with me, im a complete rookie when it comes to the visa situation...please tell me if im right or wrong here...So im currently living in Beijing China but want to come to Thailand for a few months...Im aiming to fly there for Jan 31, before i come ill need to install and complete the thai pass requirments, get a Covid test 48 hours before i come and book a hotel for 1 night in an ASQ or SHA+ Hotel (where do i find those) If everything is ok im allowed to stay for 30 days, then i can apply for 60 more days afterwards....and then if i want longer ill have to leave the country and come back. Please check me if any of this is wrong haha.....Also i need to have a flight out booked and hotel stay for the entirety of my trip....but what if i want to afventure a little bit? Also what if i plan to leave via a land border and come back in.....any help with any of my statements would be appreciated...im seeing lots of conflicting information and just want to get it right