How to get all posts on front page and into categories on subpages

I want all my posts to be available on the front page, but I also want my posts to be sortes into categories accessible from subfolders (headings).

I used the hint from rosclarke in this link, but somehow there is a lot of extra spaces in the headings when I use this hint. Is there a better way to do this, or if not, how can I remove the unnecessary spaces in the headings, to make them look like the other?

Check my page https://www.oscareksperten.dk.
The headings “Nyheder” and “Sjovheder” is created by using the technique by rosclarke.

[please allow (much) more time to get a reply – the forum is discouraging the bumping of topics]