What is Buddhism? One can learn more about Buddhism in library books. And then one can learn about the heart of Buddhism from a good teacher. And live a life of Buddhism with regular meetings of a sangha. But, to start, reading a few books will help.

What have I learned? Buddhism is something you can take in small doses or large ones. It is up to you. Buddhism presents its teachings and it becomes your wish whether to follow or dismiss it. There is no push. Most start off with the four noble truths. Life is suffering. The truth of the cause of suffering. The truth to the end of suffering. The path that leads to the end of suffering. It may explain it but it is up to you to see if there is truth in those words. And when you do learn the truth, you will believe and seek enlightenment. The most common path is thru meditation. Meditation does not guarantee enlightenment. But, there is a guarantee that there is no enlightenment without it. Mindfulness is an extension of meditation in the active waking world. Some will meditate for stress relief or some other form of benefit. Concentration, relaxation, insight etc. Later, one learns of the three jewels. Buddha, the Dharma, the Sangha. Then the three truths of Buddhism. Dukkha, Anicca, and Anatta. I wish you well on your journey.