New to Ingress? Wanna level fast?
First off, shoutout to Michael Hartley - 57Cell (Resistance) and Colin Williams - IncredibleHulk (Enlightened), for they have helped me on my Ingress journey.
This is for newer agents who are starting to get familiar with the game and want to level. Veteran agents, feel free to tack on any of your ideas or give any thoughts to help improve this.
There's to ways to gain AP quickly, and it all depends on portal density.
If you're short on time: Gather as many low-level resonators that you can, and glyph hack as often as possible. Then, just deploy. That's seriously it. Walk to a portal, deploy, then walk to the next. Glyph each portal as you're walking by them.
If you have more time, fan fielding might be your best bet. What is that?
Pick 9 portals. Choose one that will become your anchor, that is, the portal that all of the others will link back to.
Number each of the portals in your head in a "fan" pattern, 1 through 8. Throughout claiming these portals, you will need plenty of keys, so make sure that when you glyph, use the MORE symbol (middle 3 dots that form a ^ symbol), and that will increase your key output. Keys aren't always guaranteed, so make sure that you leave a mod slot open for a heat sink to reset the counter (especially if you've burned out the portal).
Then, from the anchor, link out to your chosen 8 portals. (If you so desire, you may use a SoftBank Ultra Link to make a wider fan, as I've done this for more fielding, but for now, keep it basic).
Then, starting from portal #2, link back to portal #1, then walk to portal #3. Once at portal #3, link back to portal #1, if there's line of sight. If not, link to portal #2. If there IS line of sight to portal #1, link that FIRST, THEN to portal #2. This will yield the highest amount of AP.
The goal is to link each portal in succession to the lowest numbered portal as you progress, hence why you need more keys.
Link order is important to prevent "null" fields. Ingress will always try to prioritize creating the largest triangle first, so, if you link out of order, you'll miss a field.
Remember, LV1-8 only requires AP, whereas LV9-16 require badges. Fan fields will also help with gaining badges, virtually all of them.
Whilst Ingress is a competition, I feel that strategies like this should be common knowledge. It's no different than teaching a new player how to play a card game who is your opponent.