Web-Dev resource is a great place,where you will find every "getting started" guide in one place.
React
React.js is a JavaScript library for building user interfaces. It is maintained by Facebook and a community of individual developers and companies.
React official website.Redux
Redux is an open-source JavaScript library for managing application state. It is most commonly used with libraries such as React or Angular for building user interfaces.
Redux official website.Node.js
Node.js is an open-source, cross-platform JavaScript run-time environment that executes JavaScript code outside the browser.
Node.js official websiteHeroku
Heroku is a cloud platform as a service (PaaS) supporting several programming languages.
Heroku official website.Mailchimp
MailChimp is a marketing automation platform and an email marketing service and a trading name of its operator, Rocket Science Group.
Mailchimp official website.