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I am confused… Are you saying you have an exsting blog at
https://www.georgelangenberg.com/blog/
and now installed another WP installation at
https://www.georgelangenberg.com/yoga/ ? (I don’t see it)
And the two blogs use the same database or the same tables? You see, there could be many blogs/WP instalss using the same database, but they all should have different table prefixes!
I am not sure it will work if you want to use the same tables for two separate installs…

the blog will be located here [css not edited yet]
https://www.georgelangenberg.com/yoga/yogablog/

I only want to show the categorie 6 here which is are the yoga related posts in my blog. I think I if have different table prefixes (and use the same database) I have to repost to that blog and I hoped that would not be necassary.

So I thought let’s just only show those posts of cat 6. there

You can try to apply any of the category (in)visibility plugins [search for them] though I am not sure it will not affect the “original” blog, too.

EDIT. On the yoga-blog you could try to use the Template_Tags/query_posts to get the posts from only one category.

Try this over here:
https://www.ads-software.com/support/topic/49015#post-270091