all portals are 5 blocks by 4 blocks. If you saw a very big portal, then the person who made it hacked by inventory editing and got the portals blocks and just putting them on top of each other
Make a 5x4 Portal going upwards of obsidian.
Make a nether portal.
You can't
No
No, sadly you can not make an Aether portal on the Xbox Edition of Minecraft because the Aether is part of a mod. As of now, the Xbox Edition of Minecraft does not support mods.
to make a portal to heaven you need glowstone and put the water in it
Make a nether portal.
No
Well, unfortunately it is impossible to make a portal gun without the mod. Sorry.
Those do not exist in Vanilla Minecraft. There may be a mod that allows you to do that.
Idgaf
Its impossible but in pc or xbox