When Lindsey started, she didn't know what accessibility even meant. She would see that there was an "accessibility error" and fix it, but she didn't understand why she was fixing it. A11y clicked for her when she realized that the point of accessibility was to make the web usable for people with disabilities.
Code, at its core, is about people, and it allows people to use and purchase products. Ultimately we code to make people's lives better, and if you aren't making your site accessible, then you are discriminating against the one in four people living with a disability. Accessibility is not an edge case.
Doing the following will take you far!