diff --git a/data/concepts b/data/concepts
index 3b155ce..2a22df3 100644
--- a/data/concepts
+++ b/data/concepts
@@ -10,3 +10,19 @@ static files
 tests
 models
 controllers
+request handlers
+response handlers
+documentation
+DNS resolvers
+data stores
+servers
+databases
+character encodings
+repositories
+DDoS mitigation techniques
+content delivery networks
+polyfills
+load balancers
+cloud platforms
+developers
+paying customers
diff --git a/data/language-features b/data/language-features
index 5a68da2..c89b178 100644
--- a/data/language-features
+++ b/data/language-features
@@ -23,3 +23,28 @@ pattern matching
 partial application
 closures
 hoisting
+media queries
+machine learning
+the blockchain
+prototypal inheritance
+Date.now()
+case sensitivity
+automatic semicolon insertion
+dynamic types
+static typing
+for/of loops
+the with statement
+"use strict"
+just-in-time compilation
+variadic functions
+array comprehensions
+functions as first-class citizens
+rest parameters
+shorthand method definition syntax
+sparse arrays
+regular expressions
+eval
+immediately-invoked function expressions
+syntax errors
+tail-call optimised recursive functions
+loops