How to write Meta Title tag for taxonomies?

Question

WordPress

I use WordPress within my theme in the editor there are files: "taxonomy-blog_tag.php" "taxonomy-blog_category.php" "taxonomy-actors.php" I would like to know how you can write a different Title for each taxonomy "Term title" ). Solving the issue with the help of plugins is not quoted , since I decided to almost completely abandon them.

An additional question: do these 3 files really relate to the content of my site, since the theme I use does not have "blog" there is "Video category" "video tag" "video actor" (I also wrote keywords in all three files, and when analyzing "keywords" registered by me in these files were not revealedIs it so? . If the taxonomy files presented at the beginning of the question are not related to the actual content of the site. Is it possible to create the taxonomies I need?
And how can this be done?