Fixed formatting, added example of command structure

presentation/presentation.md

@@ -2,8 +2,8 @@
 
 ## What even is \LaTeX?
 
-- 1978: Donald Knuth gets fed up by typographical errors in his documents and creates TeX
-- 1984: Leslie Lamport gets fed up with having to write bonkers TeX-commands and piles on a bunch of macros
+- 1978: Donald Knuth gets fed up by typographical errors in his documents and creates \TeX
+- 1984: Leslie Lamport gets fed up with having to write bonkers \TeX\ -commands and piles on a bunch of macros
 - 2025: We're here, still stuck with this ancient crap
 
 But actually, it is a pretty good **document preparation system**.
@@ -83,8 +83,22 @@ Here you might stick:
 - Setup for packages used in the document
 - Directives for the presentation of the types of content in the document
 
+\vspace{2em}
+
 > Tip: Make you preamble self-contained and portable
 
+## Basic structure of a \LaTeX\  command
+
+```latex
+\commandname[optionalarguments]{requriedarguments}
+```
+
+Examples:
+
+- `\usepackage[paper=a4paper]{geometry}`
+<!--- `\Delta` (produces the symbol: \(\Delta\) )-->
+- `\emph{Hello!}`
+
 ## Part 1: Content
 
 Since content and presentation is mostly separate:
@@ -101,9 +115,9 @@ Types of environments:
 Usually specified in the text with:
 
 ```latex
-\begin{content-type}
+\begin{contenttype}
 ... what you write goes here
-\end{content-type}
+\end{contenttype}
 ```
 
 ## Normal text: headings, paragraphs, lists
@@ -118,7 +132,9 @@ Usually specified in the text with:
     - `enumerate`: numbered list
     - Can be nested
 
-> Tip: For better version control, stick to *one sentence, one line*
+\vspace{2em}
+
+> Tip: For better version control, stick to **one sentence, one line**
 
 ## MATH
 
@@ -128,9 +144,11 @@ Usually specified in the text with:
 - `\(...\)`: inline math
 - `\[...\]`: basically like `equation`
 
-We're talking inline \(F = ma\) versus full display:
+We're talking inline $F = ma$ versus full display:
 
-\[E = mc^2\].
+$$
+    E = mc^2.
+$$
 
 ## Figures and tables
 
@@ -163,12 +181,12 @@ We're talking inline \(F = ma\) versus full display:
 ## Part 2: Presentation
 
 > I used to fight all the time with my typesetter about where
-> the images should be placed. Now I use \LaTeX and have accepted
+> the images should be placed. Now I use \LaTeX\  and have accepted
 > that I'll never win.
 
 . . .
 
-The \TeX typesetting engine is really powerful and will probably make
+The \TeX \ typesetting engine is really powerful and will probably make
 better choices than you.
 
 ## Linebreaks and pagebreaks
@@ -215,3 +233,11 @@ better choices than you.
     - Here, top, bottom and "special page"
 - Floats
     - They *float around* and cannot be broken up
+
+## Part 3: Custom commands
+
+- `\newcommand`: make a new one!
+- `\renewcommand`: change an existing one
+
+Some examples:
+