1: How do I host a node js/express application on netlifiy?
2: How do I connect my frontend react.js application hosted on netlify to the node js/ express server side application?
Hiya @zoe619 
, sorry for the delay in response! Welcome to the Netlify forums! 
Here are some resources that should help you get started. We can’t really answer opened questions like “how do I do x?” Once your site is up and running if you have more Netlify specific questions we would be happy to help.