Are these database tips helpful?

Hey there! I follow a lot of twitter accounts that provide simple, useful tips on topics like UI/UX, marketing, sales, and programming. I can't find one that provided simple database tips. Database Tips exists to fill that void and provide real world tips for database design.

Currently i'm seeking validation by growing a Twitter following and eventually a website and mailing list. I would also like to use this as a platform to create some online learning courses.

I've posted the first couple tips and i'm excited to get some feedback! Let me know what you think. Twitter handle is @ Database_Tips