Hello, your site should be working just fine now. I suggest you not use an cache plugins as they cause issues with our platform. Read this for more information.
You said you deleted the plugins folder, so trying to uninstall total cache won’t do anything (it most likely doesn’t even show up under plugins anymore).
Seeing as your site is just demo posts, would you be willing to scrap it and start over again with a fresh install?
@TalitaB
Wait there is quick fix for this issue,
Login to your “Wordress Admin Panel”, then go to “Settings” – “Permalinks” – and hit “Save”.
This should solve your issue