How Did You Learn to Sing?

I'd never had voice lessons before. You taught me like really the technique on how to make my voice sound less nasally and more clear or be able to have like a longer range of notes. I look back at some of the songs that I sang, especially when I was younger and it was like more nasal than I wanted it to be. And we worked on that to the point where now in that part of my tone, I don't feel like I sound nasal anymore. My favorite vocal exercises are just the very simple stretchy ones like, or just like the simple ones that you start me out with. Like what's like that mama that we start out with? Mama m