If you want the technical term for them – Categories and tags make it easier for the reader to browse through your website.It is best to add them at the time of creating the post.
it didn't work, and showed sudo chown -R bitnami:daemon /opt/bitnami/apps/wordpress/htdocs/wp-content sudo chmod -R g w /opt/bitnami/apps/wordpress/htdocs/wp-content Doesn't work for my case, I also tried to use follow manual update https://codex.wordpress.org/Upgrading_Word Press.
Delete the old wp-includes and wp-admin directories on your web host (through your FTP or shell access).
The plugin has several more features that further enhance a site owner’s ability to manage tags / site taxonomy.
As this is a premium plugin, you can only install it by uploading it to Word Press.
Now, just like the indexing in a library helps you find the book you are looking for, Categories and Tags will help a reader who lands on your website to find the exact post they are searching for.