That is a very broad topic. Many developers are calling themselves full-stack developers because this is what recruiters want.. The truth is, it can take years to truly master each domain, client, server, DB, security, performance, building tools and the list just started.. Don't forget that eventually experienced plays a major role, it takes time. Start small, if you go with js stack, play with React, Node, and MongoDb, you can then add build tools like webpack, start optimizing, deploying and extending your knowledge Just search for full stack development on youtube, you will find endless resources. To understand what it means to be a full-stack web developer check this out: https://medium.com/@tilomitra/the-javascript-engineer-skill-tree-85208643eddd

Many free css courses: https://www.reddit.com/r/learnprogramming/comments/75ovw4/250_free_udemy_course_coupons/

Some suggestions: http://jsfeeds.com/ http://javascriptweekly.com/ http://frontenddevweekly.com/ https://hashnode.com/

Basically, you have to familiarise yourself with few concepts related to SSR: Universal rendering Universal routing Universal data fetching Handling async actions Universal state management Universal mounting You can find a lot of blog post about the subject, but the best way is to get your hands dirty and start coding after you understand the concepts above. I have started to write a short recap about the subject, it's a work in progress but you can still check it out here: https://github.com/saniko/Universal-React

In short: SEO - allows search engines to crawl your pages. Performance (initial load time). Cross device support. Same code base (sharing of logic). Non js users. Catching current trends ;) In general, benefits for engineering, reusability, performance and SEO. I have started to write a short recap about the subject, it's a work in progress but you can still check it out here: https://github.com/saniko/Universal-React

I wouldn't say I use it on a daily basis, but http://mithril.js.org/ is worth checking

Start your own blog. Focus on a specific topic, explore it deeply and implement some non-trivial task, Blog about it. Blog regularly, this will force you to stay sharp.