Safari Technology Preview dropped today and while the big news is that you can use it with your iCloud account because it’s signed by Apple, there are a few basic settings you should remember about — you are setting this up as a new browser after all.
Opening links in the background is something which I do all the time on a Mac, using either the contextual menu under a two-finger tap or simply holding down the ⌘ key while clicking on a link. This means I am free to continue reading or doing whatever it is that I am doing and going back to that link later. This option is also available under iOS in Mobile Safari, but it needs to be turned on first.