This is the first essential you'll be tackling in Ingress Prime. XM is essentially the white dot particles strewn all over the game map, and you simply need to walk near them to collect them.
You'll need XM for pretty much everything. Even using many items in the game requires XM, so make sure you have plenty.
Luckily you can use Power Cubes to gain XM when there's none nearby.
Once you've found a portal and hacked it for some items, it's time to attack. You'll be using XMP Bursters to attack any portals near your location.
Portals have up to eight Resonators surrounding them which you'll be dealing damage to. Once all the Resonators are destroyed, the portal is clear.
You can also gain other items to attack portals. And of course, higher level variants of items will do more damage and get the job done faster.
Once you've destroyed enemy Resonators, it's time to place your own. You only need to place one to capture a portal, but in order to create a link, you'll need eight.
Once you've laid down eight resonators, you can link your portal to other portals in the area, and block off the enemy team.
Again, using higher level Resonators and even equipping your portal with a shield of some kind will help defend it against the enemy team.
Within control fields you will earn massive amounts of AP, so they're the big goal of the game. Plus, it's a nice way to mark your territory.
You do this by linking together at least three portals in a triangular shape, and this will make the space inside that triangle a control field.
Making large control fields for your team to reap AP rewards is the primary goal of Ingress Prime, and that's why you can chat with other members of your team to organise which portals to prioritise and link.