No unnecessarily long explaination here, just a quick tutorial for how to fix WordPress comments not showing on posts:
Fix Comments Not Showing
…Check if you have comments turned on!
You can do this by navigating to:
Appearance > Customize > Theme Settings > Comments & Trackbacks > Tick ‘enable comment on posts’ > Publish
It’s also worth checking your discussion settings – you can do this by navigating to:
Settings > Discussion > Tick ‘allow people to post comments on new articles’ > Save
What is a WordPress comment?
WordPress comes with a comment management system, meaning you can enable or disable commenting and community interaction on your posts and pages.
What is a WordPress trackback?
If you link to another WordPress blog within your content, they’ll be notified automatically using pingbacks, which is kind of like a virtual high-five. Again, completely optional.