Removing Comments
Add the following via Appearance > Customize > Additional CSS:
.blog-meta span.comments { display: none; }
Next, install the Disable Comments plugin and follow the instructions.
https://wordpress.org/plugins/disable-comments/
Removing Categories
Add the following via Appearance > Customize > Additional CSS:
body.single footer span.categories,
.cg-blog-article footer span.categories { display: none; }
Removing Tags
Add the following via Appearance > Customize > Additional CSS:
body.single footer span.tags,
.cg-blog-article footer span.tags { display: none; }