Source code and Questions
You can find the source code for the examples used in the course on Github: mirkonasato/ionic2-by-example.
The repository has a separate Git branch for each project. That way you can look at the commits on each branch/project and easily see the changes made in every course lecture. The comment for each commit includes the lecture title.
If you have any questions about the course lectures please post them in the Comments section at the bottom of each lecture.
However I have to ask you to kindly post questions there only if they are strictly related to the course materials. Unfortunately I cannot help individuals to debug issues in their own projects or provide one-on-one consulting for free, otherwise I would have to sell my courses at much higher prices. Thanks for understanding.
For general questions about Ionic there are public resources available, like the Community Forum, Stackoverflow, or Ionic Worldwide on Slack.