Here is a great place to look for tools.
Use the drop down where is says “select conversion feature” to select the format you want to go from and to. My personal experience has been, there is no one good tool that works with all file, but you can use a few different tools to get most files to work good. some of the free tools are quite good by the way (you don’t necessarily have to spend a bunch of money).
Fyi, if your final target is going to be dvd, the all in one converters are the easiest place to start.
You can do the same job as the all in one converters with several programs and sometimes get a bit better results, but there is a lot to learn for the process. If you want to take the time to take the more complex route, look at some of the guides.
goe to the format conversion drop down to select what you want to go from and to to narrow it down.