Herc08 gave a great answer.
I'll only add that I also was in a similar predicament with both of my last 2 builds. I used dongles. The main problem is they can have a more limited range plus I get tired of seeing things sticking out of my PC's(laptops or desktops) and plugging dongles in the back only decreases the range further. I was using dongles for both WIFI and Bluetooth. The other disadvantage is it takes a little more longer on booting up till they're available.
I finally got tired of all that and tried a couple of cards over the summer. This one worked like a charm.
https://www.amazon.com/gp/product/B019JH89YI/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1
There's plenty others in similar prices. If you do a card make sure of a couple of things. First make sure it truly supports the OS you're using or intending on upgrading to. Second make sure you have all the available ports(PCIe and USB). I love the one I got. I'm connected to everything and by the time my task tray fills up on booting. Much longer range and less connectivity issues plus extra features(BT 4.2!) for future devices. I also use mine for streaming from a sort-of NAS HD-media drive plugged into my router.
If your system is all close to each other than a dongle is perfect and will work fine, if not a card might be a better long term solution.