Why are there errors on the site?

Who knows the causes of errors on a new site? Have you ever experienced this? I can basically fix them, but just a few days later the problem repeats.

It happens with many people. I, too, engaged in the creation of sites, and went through it. Moreover, at the next creation of a new site, I still slip different failures. But it all can be solved simply by using this service https://pr-cy.io/ It is possible to use the website error checker. Quite a simple interface, so I am sure you will understand and be able to permanently remove the faults