Investment tips for guy who's earning 30k permonth, age :23

Hey guys , I am an IT dihadi majdur. Have zero idea about Investment. Let me share my income:

I receive 30k in hand from which I have to save 20k for my brother's engineering. Rest of the money I transfer to my mother's account as we have a small loan ( 2 lakhs aprx ). Any tips how can I start investing, heard about SIP but don't know how to do it and where to invest. Can anyone please guide me step by step.

Also I have 2.5 years of experience in Java. Any career related guidance will really help.