It's taught that a perfectly enlightened being, one who has reached the very end of the path, can create a heaven-like realm called a pure land, from which they can continue aiding sentient beings after death. But this is exceedingly difficult. Very, very few will be able to do so. So instead most ask to go to one that is already existent. There are many to choose from but only one is easily reached. That one is called Dewachen or Sukhavati. To reach it requires only that a prayer be said 10 times with devotion. The prayer is like 15 pages long, but it completely describes everything experienced there. It's like scripting your mind for the experience. The only limitation is that it can't be reached by anyone who has murdered their father, mother, or an enlightened being, or by someone who has lost faith. Doubting that it will work is fine, though.
You dissolve back into the source. Reunion with "God" or "Buddha". Perfection. Freedom to take rebirth at will in a more satisfying body, and so on. Sky's the limit.
We are scared to let go, not realizing that what we cling to is suffering. It is like we were kicked off a bottomless ledge at birth along with a rock, and as we fall we cling to the rock for safety. The rock is your physical body, which is stuck to you by the illusion of ego, which is created by past karmas. Let go of the rock and your spirit will fly. But it is very difficult to let go. The role of the Guru is to help us let go. In normal Buddhism the student does 100% of the work. In the secret traditions it is more like 20% - 30% student effort, 70% - 80% Guru effort. He meets you more than halfway. But as a consequence it is that much more difficult. Normal Buddhism takes many, many lifetimes for most. This path can be accomplished in this lifetime if you are determined. It is all a question of how much work you are willing to do, work here meaning purification and meditation, as well as study.
You will see only what you project onto it. Everything is like that. Some people think Buddhism is evil, some think Christianity is evil, some think atheism is evil. I meditate and focus on the breath and let the others argue :3
Every single thought you think is a form of meditation. Dreaming at night is a form of yoga. Buddhism is what is directly in front of your face. If thinking, dreaming, and existing are evil then everything is evil, which would be silly. There is no dogma needed beyond examining the mind and reality. Not worshipping it, not praying to it, just being aware of it, examining it. You can fit whatever spiritual beliefs wherever you want within that, or not, I don't care. We are not evangelists. We do not recruit. If it weren't for this exceedingly odd situation going on I wouldn't be typing any of this. People want to know what the secrets are in the secret traditions. Now they've seen them. It's unimportant to me whether they read any of it or not. That's up to karma, just as the negative experiences you project outwards are due to karma.
It is easy to label other people's ideas as wrong and demand they adjust to suit our desires, but it is probably not the best way to get results from free, independent human beings with minds of their own. I hope you find the best of results on your own journey, wherever that may lead you. Hopefully fun places. Life is boring otherwise.