What are the different types of visas available for Thailand and how can I understand them easily?

By the time someone has explained them to you, they will have all changed again

Youtube will explain all

1.) Non–O based on "retirement" (over age 50):

nowadays, issued as a Single Entry stay of 90 days;

2.) Non–OA:

for those over age 50,

valid for 1 year with Multiple Entries, with each Entry stay of maximum 1 year or until expiration of insurance policy (whichever happens first);

3.) Non–OX:

for those over age 50,

valid for 5 years with Multiple Entries, with each Entry stay of 1 year, and able to Extend (at a local Thai Immigration Office) for another 5 years to "10 years total";

4.) DTV:

valid for 5 years with Multiple Entries, with each Entry stay of 180 days;

5.) Non–O based on having Thai Citizen Spouse or immediate Thai Citizen family:

nowadays, issued as a Single Entry stay of 90 days;

6.) Non–B

This is a Business Visa which needs several Thai Company documents and "approvals", afterwards, a Thai Work Permit can be issued permitting work in Thailand:

usually issued as a Single Entry stay of 90 days;

7.) LTR–Wealthy Pensioner:

Have to apply to the LTR Visa Office of the Thailand Board of Investment (BOI) BEFORE applying for this Thai E–Visa;

8.) LTR–Wealthy Global Citizens:

Have to apply to the LTR Visa Office of the Thailand Board of Investment (BOI) BEFORE applying for this Thai E–Visa;

9.) SMART Visa S (Startup):

Have to apply to the LTR/SMART Visa Office of the Thailand Board of Investment (BOI) BEFORE applying for this Thai E–Visa;

go to a Visa agent and ask that question

Check this e-Visa website

You can check from here different visa types and the required documents

Just spend a little bit more time and energy looking into it. Really not that difficult.

That is the tricky part...

Yes, at the Thailand Embassy website in your country.

5555!

Maybe give people an idea of what or why you want a visa. Tourist ? Education? Retirement etc People may be able to suggest the correct ones and the difference

Your local Thai Embassy website