Unhappy [Q] Explain Link2SD with MicroSD?

No matter how many tutorials I've read I just don't understand... my guess is because of the terminology involved between the different SD cards involved... I simply want to have a partition on my MicroSD card where most of my apps live. That includes the libraries and .apk files. I don't care about large games. As far as I see, Link2SD just installs on the phone's internal SD card. How can I set that up? Is a second app needed (Foldermount?)