Apache Web Server

• Working With Server-Side Includes
• Redirecting Web Page Requests
• Setting up subdomains in Apache

Linux

• Scheduling Tasks with crontab
• Working with the vi Editor
• Working with the ls Command
• Understanding File Permissions
• Securing a Web site with the proper file permissions
• Removing Directory Access from Web Sites
• Managing User Accounts
• Redirection Basics
• Changing File Owners
• Converting Files From Windows to Unix
• Tracing a Lost Connection With Traceroute
• Simple String Replacement
• Inodes
• A (Somewhat) Easy Trick to Understanding File Permission Octals
• Decoding Binary Files with Octal Dump
• Working with root, from both CentOS and Ubuntu

SQL & MySQL

• Some Notes on General Database Design
• SQL: Constraining the Database
• MySQL(SQL): Cheat Sheet
• MySQL Admin Cheat Sheet
• Fetching & Parsing with SQL SELECT
• MySQL: Two Ways of Extracting Data using Perl
• Restore a MySQL Database from a DigitalOcean Backup

Python

• Python Basic Commands
• Python Lists
• Pandas, for Data Analysis (in progress)
• Numpy, for Fast Arrays (in progress)
• Templating with MAKO

HTML

• Rendering the Less Than symbol in HTML
• SVG Basics
• The Difference Between Class and ID
• HTTP: The King of URIs

CSS

• Making a Box For a Web Page
• Adding Background Colors To A Page

JavaScript

• Math Operations
• Functions (example)
• Loops (example)
• The Switch Statement
• Arrays
• Objects
• Object Methods (example)
• Accessing Private Variables Within Objects (example)
• Making JavaScript "Classes" (example)
• Inserting Text Into the Body of a Page (example)
• Creating random numbers
• Converting a JSON string into JavaScript objects
• JavaScript React: Intro to JSX (in progress)

Perl

• Perl Snippets

C

• C Code Snippets

Git

• Git Quick Guide

Java

• The Most Basic Java Program Possible
• Embedding a Java Applet in a Web page
• Creating an Array in Java
• Creating a Function in Java
• Creating an Object in Java

PHP

• Creating a File on Disk
• PHP Data Types
• Entering Data into MySQL Through PHP
• Passing variables from a PHP Web form to a Web page
• Post the Results of a Simple MySql Query on a Web Page

Regular Expressions

• Regular Expressions

Networking

• Networking: Windows host files

Security

• Security: Encrypt and decrypt files
• Configure SSH for the Cloud

Projects

• Roll Your Own URL Shortener
• Setting up Hadoop for a Single Node
• iTunes “Play Date” tag numeric mystery, solved!
• Build a Linux-based Web Server on DigitalOcean: Virtual Machines, SSH Keys
• Build a Linux-based Web Server on DigitalOcean: Domain Names, Apache