haha I’m glad you worked your way out of this issue! It’s good to dig a bit like you did, sometimes the solution is right there.
And don’t bother! Your “frenchy” english is good, with the little I know about french was completely possible to understand it haha
To migrate your Local site to the real site online, I recommend you read these topics:
Basically, there are Wordpress plugins for this, like Duplicator and All in One WP Migration. Or you can migrate manually, but I recommend you use one of those.
Also, remember always to backup your website when doing things like these, that could compromise your work, so you always keep it safe.
Bonne journée! 