You want to write posts, messages, E-Mail, or letters, without committing spelling mistakes. There is a very simple solution to it.

Simply Use this Google Extension:

Grammarly, Inc.

Grammarly is a cross-platform cloud-based writing assistant that reviews spelling, grammar, punctuation, clarity, engagement, and delivery mistakes. It uses AI to identify and search for an appropriate replacement for the mistake it locates.

Add from here:

https://chrome.google.com/webstore/detail/grammarly-for-chrome/kbfnbcaeplbcioakkpcpgfkobkghlhen?hl=en