How to Remove "Archive For" and I have too many widgets?

I would like to know if I can remove the “Archive for” from the start of a page. I tried to remove the words “Archive For” in the archive.php so my theme but it results in the pages not loading.

Also, I can’t get some of the sidebar widgets to work properly and in the admin panel there are multiple versions of them. Why would that bit?

One final thing, am I able to have to create a blog section on the site for myself that isn’t directly related to the site. I don’t want it to appear on the menu under the header, I’d want it to appear in a box only that says “Personal Blog”