To give an idea of the conversion, the shared hosting's "100GB/day" memory limit is roughly equivalent to one process using 60MB continuously (node apps especially tend to use more than this, and PHP can do similar if there's a lot of traffic or inefficient, long running code like WP installed). With a VPS, you can use the entire 1GB 24/7 if you need to.
For CPU, the shared server has several cores, and you get to use a certain % of the available CPU time, with too much resulting in suspension. On a VPS, you can peg it continuously without issue.
Keep in mind all you get on a VPS by default is an empty linux box with SSH access. You'll need to actually install a web server on it (most people just put a control panel like Hestia or Keyhelp on it).