Can you please explain how you removed the previous & next from posts?
You can remove post navigation on single posts with this custom CSS:
.single .nav-links {
display: none;
}
Don’t edit the theme files directly, otherwise your changes will be overwritten every time the theme is updated to the latest version.
An easy way to add custom CSS is to install the Jetpack plugin and activate the Custom CSS module. You’ll then add your custom CSS in the new stylesheet editor that’ll appear in your dashboard, under Appearance > Edit CSS.
As alternatives, you could either install a standalone custom CSS plugin, or create a child theme.
Alternatively, can you explain how to exclude specific posts categories so they don’t show up in the previous & next buttons?
This is much more complicated so for a non-coder I’d recommend simply removing the post navigation. ??