Well I start to think those are not bugs, but rather just things not mentioned in the Crash course.
I already got rid of 3 of those erros by installing module CommunityCommons from the App Store.
https://appstore.home.mendix.com/link/app/170/
for the layout problem, it caused that the project is using old layout which doesn’t exist, double click the error message, open the page, change layout to existing layout, it will work.
you need import latest Community Commons Function Library from App store into your workspace/project .