Secure identification, authentication, authorization. What's better?

Question

User identification

Studying this issue, I found discrepancies with the information on Habr and Mozilla Dev, well, in other sources ...
What is still better? sending POST forms or GET. Possibly: PATH PUT REQUEST BASIK HTTP. Tried POST (Problem with double submission of the form, and a crooked solution to the update problem). There are suspicions that GET requests after the introduction of HTTPS are still becoming safer.
Due to the fact that you can also put POST on crutches, it is important that the security policy be self-sufficient.

Answer 1

post
get is limited in length - there will be problems in browsers, well, with mitm it immediately turns into a problem