How to correct and reduce error 400 and 500

I have some issue with my websites I have a lot error 400 and 500
How i can fix that?

Some one can help to fix that.

I have some restriction in waf about country block and continent, also TLS minimum 1.2.

These are either response code coming from your origin. You need to see what is causing the errors there to be able to reduce them.

Sorry for my silly question where i can see that in Cloudflare? @Cyb3r-Jak3

What do you mean, where can you see it? Those error codes are not coming from Cloudflare, they are coming from the server that is proxied by Cloudflare.

@Cyb3r-Jak3 Thanks for your explanation now i understand how work.

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