The last point is the one it took me the longest to understand. Telling everyone who will listen about your business ideas (not just prospective clients) helps

The last point is the one it took me the longest to understand. Telling everyone who will listen about your business ideas (not just prospective clients) helps you to anticipate common objections, understand which aspects of it are easiest to explain/understand, which aspects of it are most valuable (focus on those), and iterate towards improvement before even getting a single user. It happens to also be excellent sales practice, but don't treat these conversations like sales calls. (The process requires reading between the lines a bit because people don't always know what they really want or don't know how to explain it.)