It would be great to have some tutorials from a seasoned developer.

I think it might be interesting to touch these subjects:
- Security (SQL injection, XSS, file inclusion, …)
- Traces
- Stencils
- 3D2D
Also…
- Building small projects (e.g. a CRUD app).
- Interesting libraries that can increase productivity (e.g. debugging with
https://github.com/kikito/inspect.lua).
- Going over interesting technical problems that you’ve come across, and showing how you solved them.