When you write an article or you complete a tutorial or any other activity, you may see tabs that lead to METADATA info.

METADATA info is not the data, but info about the data.

So we may have in our CMS:

1) Alias which is top near to title and we may edit.

2) Meta Description, which is a place for a small description about 150  chars, that is shown in the appearance of the article or lesson title or product e.t.c.  in Google, Yandex, e.t.c 

3) Key Words, that are spoken about the article e.t.c

If you want to have a GODD SEO, you must complete 1 and 2.

There are ways to do like

https://yoast.com/beginners-guide-yoast-seo/

which means one by one

or you can use plugins or extensions that can do this in sets of articles e.t.c.

In our LMS we suggest the Yoast way:

WordPress

Joomla

Drupal

For more do your Googling