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Arguably the most important concept in Buddhism is "dukkha". The word is impossible to precisely translate into English, but the closest word is probably "dissatisfaction". Pain is dukkha, sickness is dukkha, wanting something we can't have is dukkha, having something and losing it is dukkha, wanting things to change is dukkha, wanting things to stay the same is dukkha.
The goal of Buddhist practice is the cessation of dukkha, which is achieved by following the Noble Eightfold Path. By living a morally virtuous life, gaining insight into the nature of reality and learning to focus the mind through meditation, we can achieve a state of liberation (nirvana).
Traditional Buddhists believe that nirvana allows us to escape the cycle of death and rebirth, while secular Buddhists simply believe that it allows us to achieve true inner peace - no fear, no yearning, no anger, no greed, no pleasure, no pain, just a complete acceptance of reality as it is, not how we would like it to be.
That state of being might seem like it would be terribly flat and meaningless, but really it's the opposite. Think about what it means to completely and unconditionally accept another person. I can't say whether I've ever met an enlightened being, but I have met a few monks who treated me with absolute acceptance; these were undoubtedly the most profound experiences of my life.
This channel is an excellent guide to Buddhist thought, without any waffle or nonsense:
From a religious Buddhist perspective, I can recommend the teachings of Ajahn Brahm and Ajahn Amaro. They're both British blokes who were ordained in the Thai forest tradition, which is a no-nonsense working-class school of Buddhism. They've got loads of talks and guided meditations on YouTube. The robes and chanting are a bit weirdy-beardy, but if you can look past that, there's loads of really useful stuff to learn.
Sage for being a hippie.