Is it hard to get into college in Australia?

I'm curious, how challenging is it to secure admission into a university in Australia? Are there specific requirements or hurdles that prospective students often face? Do Australian institutions have a rigorous application process, or is it relatively straightforward? Additionally, do they consider factors like international student status, academic performance, and extracurricular activities when making admission decisions? I'd love to gain a deeper understanding of the complexities involved in the college admission process in Australia.