Dheeraj Sudan and Meenu Hinduja-How do I start building open-source Android apps to share on F-Droid?

Hi Everyone, I’m Meenu Hinduja and my husband Dheeraj Sudan, run a business. I’m interested in getting started with building open-source Android apps and eventually sharing them on F-Droid. I’d really appreciate advice from those of you who’ve already done this. Regards Dheeraj Sudan and Meenu Hinduja