All of your questions are answered in the documentation. Start with the readme file and take the time to read the whole thing. Then go to my web page and read the extended help, which provides even more examples. Again, take your time and read the whole thing. There's a lot to Better Together. It's a large and complex system. Some people have to hire out the installation and maintenance of things like this, and some people use other solutions like Cross Sell because they find Better Together too hairy. It's entirely your choice.