Broken links

I have recently purchased the total theme package and began to test/play with various themes. I am having the same problem with every one I tried so far and not sure what is going on.

All listings, whether the samples or my own uploads have broken links. The categories also have broken links. I know enough WP to be advanced beyond basic as I developed my own in the past, however, the prepackaged theme (s) are something new to me.

Can anyone offer advice on this? Thank you and look forward to pay it forward in time

One of my sites: https://directory.erniemeyer.com/