[whichdan]

From an interviewer's perspective, they just want to see that you can use GitHub and write some code that looks well-formatted and well-reasoned. Nothing is more disheartening than opening up someone's GitHub profile and seeing 70 repositories, most of which have less than 10 commits, or are just forks.

I'd recommend using GitHub however you want, and when you want to apply for jobs, create a small website on GitHub Pages highlighting your best projects. If you can intelligently talk about your different projects and how you improved between them, that will be a hugely positive signal when applying for a junior position.