Getting certs.

Good evening fellow infiltrators.
I know there are probably a thousand threads like this, but alas I don't seem to be able to use the search function of this forum very well and all it gave me was a thousand threads that have nothing but two words about certs.
So I was just wondering how do you get certs the best as an infiltrator? Or if you don't use infiltrator to do the job, how do you do it?
I've heard of people getting 300 certs / h but I just have NO idea how that can be done. Seriously I though that I did fairly well yesterday and all I got was like 30 certs / h. And that pisses me off.
Any tips for a brother in cloak?

if im on my own i take a bolt action with x10 or x12 to the crown and countersnipe
if im in a pub squad ill take a x6 and try and rack up a load of medium (80-100m) range assists or flank around to where i can see enemies in cover and headshot them
my outfit isn't really up and running yet but im hoping to do gal drops onto towers and the "keeps" of big bases and generally annoy people there
the countersniping is by far the most efficient cert gain (i usually get about 40-60 per hour depending on where im shooting from, amount of headshots, amount of enemy snipers etc) if you can consistently land headshots at long range but my god is it dull
ive done a few gal drops and they're great fun but the cert gain is not great.
300certs/hour is (insert expletive here) and whoever told you that is either lying, not playing infil or both

I'd like to know as well on the other hand 30 an hour would be an increase for me... xD It's more like 10/h for me yes I'm that bad.

CQB

So the crown + countersniping? Though I have no idea where this crown is, I think I gotta find out!

I wonder how you're supposed to get good amount of certs from this? I can't seem to be able to rack up kills in CQC compared to what I can do while sniping... and I can't get too many from sniping either.

The Crown is about the middle of the map on the Indar continent, north of the Crossroads Watchtower.

First video is actually the second part, but shows how to grind certs more easily as an infiltrator.
The second vid shows more "legitimate" strategies for grinding certs while actually playing the game.