I was struggeling with many 404 errors on my magazine website. I have done some changes in the menu and categories as well, there is a large live forum too. So that I started to solve out redirections and page not founds. I tried one component but it didn'n work properly, then I discovered Qlue custom 404. Installation in a bit, set the 404 page with my custom and description includes link to the homepage. Job done in 5 minutes. No htaccess file changes needed in my case (non-profi version in use). Thank you guys!