Agreed! I'm a huge proponent of side-hustlin'
I started my second company on the side while I was working at a large software company. On top of the full-time corporate gig I had recently gotten married and was expecting my first child. My first app launched only a couple of weeks after the birth of my daughter which was perfect because It was partly inspired by her (it was an app for kids). The app ended up doing really well on the App Store cracking the Top 50 overall list. After a few more months of hard work I was able to leave my job and haven't looked back since.
Side hustles are like tricycles...it's the first step to learning to ride on your own.