Capturing Portals

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There are three types of portals throughout the game. The first is a friendly portal, they are colored the same as your faction. The second is an enemy portal, they are the colored different that you own. The third is called a “grey”, they are the portals that have not been aligned to a faction yet and are the easiest to capture. One can make Level 8 simply by capturing and fully deploying 600 Portals, in case you’re curious.

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Shown in you scanner app you have a range indicator, place the orange ring on the portal and open the portal interface by clicking on the portal. That opens the Portal Detail View (details on the Scanner use can be found here).
Next press the Deploy button and deploy resonators onto the portal. If you start at your lowest, it will automatically step up to the next higher resonator as you reach your limit. Same applies if you start at your highest. You have now captured a portal.
Keep in mind that the distance you are from the Portal directly effects the distance the resonators deploy from the Portal center, as shown by the 1 and 2 on the Screenshot to the left. The greater the distance between resonators the less damage a portal receives from a single XMP strike.
ALWAYS deploy Portal Mods, whether it is offensive or defensive. Of the four mod slots on a Portal, each player can only deploy 2. Also, the Portal Mod is now there for the life of the portal. The Mods must be destroyed by XMPs in order to be removed, so choose wisely.

Each Mod gives you 125 AP and strengthens the defense of the Portal requiring more ammo to take down. The more ammunition you make your opponent use, the better!
Always fully deploy your portals, not only do you get 125 AP per resonator deployed and a 250 bonus for filling all slots, but you cannot link from or to a Portal that has not been fully deployed. Nothing is worse than driving across town just to deploy a couple resonators.