Buddhism opens less like a creed and more like a physician's report. The Buddha's first teaching wasn't a picture of God or the cosmos — it was four plain statements about why life aches and what to do about it.
Everything else grows from there. Where a theistic religion starts with a being to worship, Buddhism starts with a problem to solve: we chase what won't last, recoil from what we can't avoid, and mistake a changing bundle of experience for a solid, permanent “me.” The result is dukkha — the low, persistent friction the tradition translates as suffering or unsatisfactoriness. The good news, and it is meant as good news, is that this friction has a cause, and a cause that ends can be ended.
The ideas below are the working parts of that claim. Read them as one connected argument, not a list: the truths name the problem, the path is the training, and the deeper concepts — impermanence, no-self, the immeasurable qualities of heart — explain why the training works. Each opens into its own page as this section grows.