diff --git a/.gitignore b/.gitignore
index 6a513a0..70d85ca 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,5 @@
 .DS_Store
 bin/configlet
 bin/configlet.exe
+
+concepts/_template/
diff --git a/concepts/basics/about.md b/concepts/basics/about.md
new file mode 100644
index 0000000..4b51d64
--- /dev/null
+++ b/concepts/basics/about.md
@@ -0,0 +1 @@
+# About
diff --git a/concepts/basics/introduction.md b/concepts/basics/introduction.md
new file mode 100644
index 0000000..e10b99d
--- /dev/null
+++ b/concepts/basics/introduction.md
@@ -0,0 +1 @@
+# Introduction
diff --git a/concepts/basics/links.json b/concepts/basics/links.json
new file mode 100644
index 0000000..0d4f101
--- /dev/null
+++ b/concepts/basics/links.json
@@ -0,0 +1,2 @@
+[
+]
diff --git a/concepts/functions/about.md b/concepts/functions/about.md
new file mode 100644
index 0000000..f109e93
--- /dev/null
+++ b/concepts/functions/about.md
@@ -0,0 +1,6 @@
+# About
+
+TODO:
+
+* Most exercises here are written as functions, because they are reusable and easy to test, which makes them perfect for separating pieces of code.
+* Function names by convention should be verbs or contain verbs.
diff --git a/concepts/functions/introduction.md b/concepts/functions/introduction.md
new file mode 100644
index 0000000..e10b99d
--- /dev/null
+++ b/concepts/functions/introduction.md
@@ -0,0 +1 @@
+# Introduction
diff --git a/concepts/functions/links.json b/concepts/functions/links.json
new file mode 100644
index 0000000..0d4f101
--- /dev/null
+++ b/concepts/functions/links.json
@@ -0,0 +1,2 @@
+[
+]
diff --git a/concepts/script/about.md b/concepts/script/about.md
new file mode 100644
index 0000000..4b51d64
--- /dev/null
+++ b/concepts/script/about.md
@@ -0,0 +1 @@
+# About
diff --git a/concepts/script/introduction.md b/concepts/script/introduction.md
new file mode 100644
index 0000000..e10b99d
--- /dev/null
+++ b/concepts/script/introduction.md
@@ -0,0 +1 @@
+# Introduction
diff --git a/concepts/script/links.json b/concepts/script/links.json
new file mode 100644
index 0000000..0d4f101
--- /dev/null
+++ b/concepts/script/links.json
@@ -0,0 +1,2 @@
+[
+]
diff --git a/concepts/strings/about.md b/concepts/strings/about.md
new file mode 100644
index 0000000..4b51d64
--- /dev/null
+++ b/concepts/strings/about.md
@@ -0,0 +1 @@
+# About
diff --git a/concepts/strings/introduction.md b/concepts/strings/introduction.md
new file mode 100644
index 0000000..e10b99d
--- /dev/null
+++ b/concepts/strings/introduction.md
@@ -0,0 +1 @@
+# Introduction
diff --git a/concepts/strings/links.json b/concepts/strings/links.json
new file mode 100644
index 0000000..0d4f101
--- /dev/null
+++ b/concepts/strings/links.json
@@ -0,0 +1,2 @@
+[
+]
diff --git a/config.json b/config.json
index 8321363..904994d 100644
--- a/config.json
+++ b/config.json
@@ -17,45 +17,21 @@
   },
   "concepts": [
     {
-      "slug": "values",
-      "name": "Values",
-      "blurb": "Values are data.",
-      "uuid": "88ecb9e0-2905-4f69-bb05-807f662cb582"
+      "slug": "basics",
+      "name": "Basics",
+      "blurb": "General info about writing programs in Red.",
+      "uuid": "726350c1-59c1-4ae6-8c72-a1e49ce7a0ed"
     },
     {
-      "slug": "types",
-      "name": "Types",
-      "blurb": "Each value has a type. Red allows you to choose from more than 50 types.",
-      "uuid": "742888d9-c939-466b-abdb-1f8b43399f86"
+      "slug": "script",
+      "name": "Script",
+      "blurb": "Script is set of instructions beginning with a header. It can be read from file.",
+      "uuid": "ad9b3663-1194-4f5b-bce7-ec1e35042b2a"
     },
     {
-      "slug": "words",
-      "name": "Words",
-      "blurb": "Words are names for data",
-      "uuid": "6b8150e5-dfeb-4273-b020-240dc025190b"
-    },
-    {
-      "slug": "blocks",
-      "name": "Blocks",
-      "blurb": "Blocks are groups of words and variables.",
-      "uuid": "8e760b20-e8a9-4b66-93a3-413c10726983"
-    },
-    {
-      "slug": "evaluation",
-      "name": "Evaluation",
-      "blurb": "Evaluation makes a values from some code.",
-      "uuid": "5fd2a02f-60d0-4f9f-b44d-808d6d625558"
-    },
-    {
-      "slug": "debugging",
-      "name": "Debugging",
-      "blurb": "Debugging is a process of finding errors in code.",
-      "uuid": "4bb97232-6f21-439e-bcf6-64cf5765d091"
-    },
-    {
-      "slug": "strings-series",
-      "name": "Strings and other series.",
-      "blurb": "Strings are values of type string!. Strings usually represent text.",
+      "slug": "strings",
+      "name": "String! type",
+      "blurb": "Strings are values of type string!. They usually represent textual data.",
       "uuid": "a936c324-9503-4acc-968f-ab18b8092ed0"
     },
     {
@@ -63,24 +39,6 @@
       "name": "Functions",
       "blurb": "Functions usually do something useful. And they usually return a value.",
       "uuid": "af09604a-bbfc-460f-8b78-5850abf16bea"
-    },
-    {
-      "slug": "contexts",
-      "name": "Contexts",
-      "blurb": "Context is a set of words and their values.",
-      "uuid": "f6dcf1e4-df5c-4cb9-bf35-26ff883ae796"
-    },
-    {
-      "slug": "view",
-      "name": "View",
-      "blurb": "View is Red's module used for programming graphical user interface.",
-      "uuid": "e09fd445-ad55-4c04-a7f8-fa4b78e1cfbb"
-    },
-    {
-      "slug": "vid",
-      "name": "VID",
-      "blurb": "VID is a dialect useful for easily defining GUI objects and layouts.",
-      "uuid": "e09fd445-ad55-4c04-a7f8-fa4b78e1cfbb"
     }
   ],
   "tags": [
@@ -111,7 +69,7 @@
       "icon": "features-oop"
     },
     {
-      "title": "Homoiconic",
+      "title": "Code is data",
       "content": "Red is its own meta-language and own data-format. Program can operate on it's own code.",
       "icon": "features-oop"
     },
@@ -139,7 +97,7 @@
         "name": "Hello World",
         "status": "wip",
         "uuid": "1d2e9dab-d85e-4b30-b414-1ebd969475ad",
-        "practices": [],
+        "practices": ["basics", "script-header", "strings"],
         "prerequisites": [],
         "difficulty": 1
       }
diff --git a/exercises/practice/hello-world/.meta/tests.toml b/exercises/practice/hello-world/.meta/tests.toml
new file mode 100644
index 0000000..e64aebe
--- /dev/null
+++ b/exercises/practice/hello-world/.meta/tests.toml
@@ -0,0 +1,4 @@
+[canonical-tests]
+
+# Say Hi!
+"af9ffe10-dc13-42d8-a742-e7bdafac449d" = true