Ask HN: How to get started writing a blog?

I'm a programmer, currently pursuing a bachelor's in computer science and I'd like to start blogging to share my thoughts and experiences about various topics, not just programming. But in case of technical topics, how do I get over the fact that I'm not good enough or experienced enough to write about that particular topic? In general how do I get started writing blogs (not asking about the tech stack) and share it with people across the internet and form a sort of community?