Creating a web app shouldn't require mastering three languages and four frameworks.
The pros and cons of the Go To command, what is left of "nerd" culture, and a rule for measuring scope creep.
Trying to build a site that grabs data from all over the place. The Chrome network tab is your new best friend.
Think of your code quality as if it will run forever, but adapt to change as if your code will be obsolete tomorrow.