I did not make a 404 error. How can I help search engines index the site now?

Question

Search Engine Optimization

I uploaded the site to the hosting without making a 404 error. The site worked like this for a couple of weeks. Now everything is working as it should, there is 404) I set up meta key and description tags.
Yandex and Google do not index at all, the sensations are like that. I think that they were offended by me because of 404. Tell me how to appease them?)) What actions from me will help speed up this process?

Answer 1

and here 404 and indexing? What do you mean "do not index"? the robot does not walk on your site?

Answer 2

And what about the 404 error? Search engines don't care if you have it or not