From d60ad3caeaaf1bad809c47f3ea1a3cd9a59c476d Mon Sep 17 00:00:00 2001
From: Drew DeVault <sir@cmpwn.com>
Date: Tue, 16 May 2023 11:40:02 +0200
Subject: Flesh out about free software

---
 assets/sass/_custom.scss       | 28 ++++++++++++++++++++++++++++
 content/learn/_index.md        | 33 +++++++++++++++++++++++++++++++++
 content/learn/copyleft.md      |  2 +-
 content/learn/four-freedoms.md |  4 ++++
 content/learn/licenses.md      |  2 +-
 5 files changed, 67 insertions(+), 2 deletions(-)
 create mode 100644 content/learn/four-freedoms.md

diff --git a/assets/sass/_custom.scss b/assets/sass/_custom.scss
index 33f42e7..ded3df1 100644
--- a/assets/sass/_custom.scss
+++ b/assets/sass/_custom.scss
@@ -4,6 +4,10 @@
 
 a {
 	text-decoration: underline;
+
+	&:hover {
+		text-decoration: none;
+	}
 }
 
 a.button, nav a, aside a {
@@ -23,3 +27,27 @@ b, strong {
 		max-width: 30rem;
 	}
 }
+
+.next-button {
+	padding: 0.5rem 1rem;
+	margin-bottom: 0.75rem;
+	border-radius: 0.25rem;
+	width: 16rem;
+	max-width: 40vw;
+	position: relative;
+	display: flex;
+	align-items: center;
+	text-align: center;
+	justify-content: center;
+
+	&::after {
+		background-image: var(--next-icon);
+		content: "";
+		margin-left: 0.67rem;
+		height: 0.8rem;
+		width: 0.8rem;
+		background-size: 100%;
+		background-repeat: no-repeat;
+		transform-origin: 50% 50%;
+	}
+}
diff --git a/content/learn/_index.md b/content/learn/_index.md
index 76c8eb7..1d953ba 100644
--- a/content/learn/_index.md
+++ b/content/learn/_index.md
@@ -31,3 +31,36 @@ essential freedoms*:
 
 Software which upholds these freedoms is **free software**. Software which does
 not is **non-free**.
+
+{{< button "/learn/four-freedoms" "Next: The four freedoms" "next-button" >}}
+
+## What is "open source" software?
+
+**Open Source** is a movement similar to the Free Software movement. The
+movements differ mainly in their target audience: open source is more commercial
+in its focus, and free software is more about the users. Nevertheless, the two
+movements are closely related and often work together. Each movement provides a
+different view of software freedom, but in practice nearly all software which is
+considered free software is also considered open source and vice-versa. The Open
+Source definition and the four freedoms are compatible with one another.
+
+The two movements as a whole are often referred to as "free and open source
+software", or "FOSS".
+
+{{< tip >}}
+Generally speaking, all open source software is free software, and vice versa.
+{{< /tip >}}
+
+You can learn more about Open Source at
+[opensource.org](https://opensource.org/).
+
+## What is "source available" software?
+
+"Source available" software refers to any software for which the source code is
+available, but which does not uphold the four freedoms. It might limit
+commercial use, restrict redistribution, prevent the user from modifying the
+software, and so on. Source available software is non-free.
+
+{{< tip "warning" >}}
+All source available software is non-free.
+{{< /tip >}}
diff --git a/content/learn/copyleft.md b/content/learn/copyleft.md
index 3c15ee1..faa3d92 100644
--- a/content/learn/copyleft.md
+++ b/content/learn/copyleft.md
@@ -1,4 +1,4 @@
 ---
 title: What is copyleft?
-weight: -10
+weight: -8
 ---
diff --git a/content/learn/four-freedoms.md b/content/learn/four-freedoms.md
new file mode 100644
index 0000000..78ea6d1
--- /dev/null
+++ b/content/learn/four-freedoms.md
@@ -0,0 +1,4 @@
+---
+title: The four freedoms
+weight: -10
+---
diff --git a/content/learn/licenses.md b/content/learn/licenses.md
index 5f5a48f..6d976d0 100644
--- a/content/learn/licenses.md
+++ b/content/learn/licenses.md
@@ -1,4 +1,4 @@
 ---
 title: Free software licenses
-weight: -10
+weight: -9
 ---
-- 
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