concepts

WEB
    browser
        DOM
        events
        html/css
        rendering
        html5 api's (canvas, etc)

    server
        http
        socket / binding / ports
        request / response
        response handlers

    both / intersection
        JSON
        javascript
        cookies / sessions
        jsonp / coors
        https

PROGRAMMING
    syntax & concepts
        arrays
        types
        conditionals
        functions
        callbacks
        runtime stack
        closures
        scope
        data structures
        algorithms
        modularity / seperation of concerns

    javascript
        node
        npm packages
        main libraries

    workflow
        git
        testing
        documentation

SERVERS
    Iaas / Paas
        AWS, Heoroku, etc.
    linux distros
        ubuntu
        centOS
    administration
        users / permissions
        service daemons / init system
        package manager / apt-get or yum
    ssh
        authorized keys
        tunneling
        port forwarding
    networking
        firewall
        ports
        proxies
        
    common setups
        nginx / apache
        MongoDB, postgreSQL
        
OTHER / GENERAL
    networking
        network layers / protocols
        DNS / routing
        distributed systems

    databases
        mongoDB
        mySQL or postgres

    security
        ssh
        authentication / authorization
        firewalls
        VPN
        asymetric key crypto
        hash functions

    systems / os
        memory / persitance
        process model
        file system
        concurrency
    
    WWW practices
        analytics
        mobile / browser specific things / phonegap
        
    theory
        regular expressions / FSA
        time & space complexity
        turing completeness