My CompTIA A+ Journey – Part 2

Intro to Computers and Operating Systems

Welcome back to the second part of my journey toward earning my CompTIA A+ certification. In this section, I learned about the different types of computers we use every day and how they show up in almost everything around us. I also explored the major operating systems and the key features that make each one work the way it does. I’m still following along with the Udemy course, but I also picked up the All‑in‑One book that goes with it so I can dive even deeper into the material. In this post, I’ll break down what I learned as I continue moving through the A+ content.

Primary PC Components

In this part of the course, I learned about the main components you’d find in a typical desktop setup. A lot of people assume the big box of hardware on their desk is the computer, but it’s actually called the system unit. That’s where all the important internal parts live—the CPU, RAM, storage, and everything else that makes the computer actually work. Around the system unit are all the devices we use to interact with the computer, like monitors, keyboards, mice, printers, speakers, webcams, controllers, and microphones. Each one has its own job, whether it’s displaying information, letting us input commands, or helping us communicate. This section was simply a quick breakdown of the common components most people use at home or in a workplace setting.

Touring a PC

This section covered the different types of computer cases and the common ports found on a motherboard. I learned the difference between open and closed cases, along with the four main closed‑case sizes: full tower, mid‑tower, mini tower, and small form factor. Each size supports specific motherboard types and offers different levels of space, cooling, and upgrade options. From there, the lesson moved into key motherboard components like the CPU and the various ports we use to connect devices. I went through the different USB types (A, B, C, mini, and micro), common display ports like HDMI, DisplayPort, VGA, and Thunderbolt, and the audio ports used for headphones and speakers. These are all core pieces of hardware the A+ exam expects you to recognize, so getting familiar with what they look like and what they do is important as I keep moving forward.

In this section of the course, I learned about the different types of computer cases and the common ports you’ll find on a motherboard. Here’s a simple breakdown of what I covered:

Computer Case Types

There are two main styles: open cases and closed cases.
Closed cases are the most common and protect components from dust and damage while maintaining airflow.
Open cases expose all components, offering better cooling but less protection.

Closed Case Sizes (Form Factors)

Full Tower: Supports ATX or extended ATX motherboards; largest size with lots of room and cooling.
Mid‑Tower: The most common size; supports ATX; balances space and performance.
Mini Tower: Works with micro‑ATX; smaller and good for compact setups.
Small Form Factor (SFF): Designed for mini‑ITX; very small but limited for upgrades.

Why Form Factor Matters

Standardized sizes ensure compatibility between the case, motherboard, and power supply.
Helps make sure everything fits and works together properly.

Key Motherboard Components and Ports

CPU: The brain of the computer that handles all processing.
Peripheral Connections: Ports for devices like keyboards, mice, and monitors.

Common USB Ports

USB Type‑A: Standard rectangular port found on most computers.
USB Type‑B: Square port often used for printers.
USB Type‑C: Smaller, reversible, and supports fast data and video.
Mini USB and Micro USB: Older, smaller ports used on older phones and accessories.

Common Display Ports

HDMI: Carries both video and audio; common on TVs and monitors.
DisplayPort: High‑quality digital video; popular for gaming and pro graphics.
VGA: Older analog port used for older monitors and projectors.
Thunderbolt: High‑speed port combining USB‑C and DisplayPort; common on Macs.

Audio Ports

3.5mm Jacks: Standard headphone and microphone ports, often color‑coded.
Optical Audio (TOSLINK): Digital audio output for high‑quality sound systems.

These are the main ports and components you’ll see on the CompTIA A+ exam. Getting familiar with what they look like and what they do makes the rest of the hardware section much easier to understand.