Now that we boot Debian from a MicroSD card and expand its file system capacity, the final step to complete setting up is to share Internet from my main computer. I got a windows computer, so I will do it from there. Instruction to other platforms should be similar.
If you rather watch a video, I pretty much follow this video, it helps a lot! I really need to thanks the people (in this case a professor) who share their knowledge for the good of everyone!