One the smartest and wealthiest men alive said, "If you don't find a way to make money while you sleep, you will work until you die" 
From my experience a good start is saving and investing at least 50% of it.
I believe ACORNS Investment App is one of the best for small start.
- You can start with basically $20
- You can invest as low as $5 weekly
- You can invest spare change from your daily purchases
- And it is free for students and only $1 a month for others.
Basically it puts your money to work for you. And it works for me because the return is somewhere 8%-12% annually.
REMINDER: THIS IS NOT AN ADVERTISEMENT THIS JUST FEEDBACK FROM MY OWN EXPERIENCE AND USE.
Check out the YouTube video below.