How to upskill

Hi!

I would like to know po and ask for advice na rin on how should I upskill po? Currently in a working in a corpo job and since starting pa lang, saktuhan lang po ang sweldo ko, and I wanna learn the proper steps on how I can make myself more valuable po? Any side-hustles din na you can suggest for me and how to prepare for it? And when upskilling, how will I able to use it po after learning a skill/s? Where can I also upskill?

Thank you guys!