Sailing alone. How? The technical issues for solo sailing across oceans

Sailing alone means: no crew, no arguments, no bad food. It's just me. I'm responsible for everything. I am free. But sailing alone also means: danger. When do I sleep? What if I fall ill? There are no sailing courses and only a few books. You have to learn by doing. You make mistakes and in the best case you learn from them. Sometimes that's hard and expensive.