How do you switch from a non-IT background to a software development career?

I'm interested in transitioning from a non-IT background into software development, but I'm unsure where to begin. There are so many programming languages, frameworks, and learning resources that it feels overwhelming to choose the right path.

Can someone explain the best roadmap for switching to a software development career, including the skills to learn, projects to build, certifications (if any), and how to prepare for technical interviews? I'd also appreciate advice on creating a portfolio, gaining practical experience, and applying for entry-level developer roles without prior IT work experience.