A Portal is a doorway to another place/demension. These are extremely dangerous and should be closed the second they are found. The asural plan is reached though your mind, not a Portal.
As far as opening them goes DON'T!! There is no way to control what demension they will be a doorway to, or what can and can not move though them. As I said before this is highly dangerous.
As for closing them, first make sure that whatever came though them is back where it should be. Then, ocncentrated pure/blessed energy, along with lots of wards can be used to close them. The only one I have ever closed was very hard to do, because it opened into a dark and powerful place. It took 4 powerful people to closed, and one very powerful person to put up the wards. All and all that is 5 people for one doorway. Also, it tock us a month of re-closing smaller ones, and putting up more wards before it stayed closed.
I know it is possible to make a portal to a happy place, but then something bad could go into it from this world. I don't recommend messing with this aspect of Magick, unless you plan on becoming a guard who closes, and watches over closed portals.
Hope this helped you, Merry Meet and Merry Part
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Replying to:
Over my years of being a practising Wiccan, the word 'Portal' has come up a lot. I was wondering, what IS a portal, how do you open and close them, and what are they for? Please email me!
Oh, and your website is the best I've ever come across!