TLDR : Answer Summary
The TR visa allows for an initial stay of 60 days in Thailand, with a possibility of a 30-day extension. To transition from a TR to an ED visa, you can look for schools after arriving. However, some confusion exists regarding the conversion process. If your previous visa was an STV with multiple COVID extensions, you can return to Thailand on a TR visa after staying in your country for two weeks. For the TR visa, you'll need to prepare cash (20,000 baht or equivalent), proof of accommodation, and a flight out of Thailand within the 60 days. Insurance is not required for the TR visa but is necessary for obtaining a ThailandPass, with a minimum coverage of $10,000 starting from May 1st.