Lesson 21: Understanding Plugins

Objectives

• Understand what WordPress plugins are and how they work
• Know how to find, install, activate, and update plugins
• Evaluate plugins for quality and safety
• Manage your plugin collection

What Are Plugins?

Plugins are software add-ons that extend WordPress functionality. They can add almost anything:

• Contact forms
• SEO tools
• E-commerce (entire online stores)
• Security features
• Performance optimization
• Social media integration
• Backup systems
• And thousands more

Think of plugins as apps for your website — just like you install apps on your phone to add features.

Finding and Installing Plugins

Method 1: WordPress Plugin Directory (In Admin)

1. Go to Plugins → Add New Plugin
2. Search for what you need (e.g., "contact form" or "SEO")
3. Browse results and evaluate options
4. Click "Install Now"
5. Click "Activate"

Method 2: Upload a ZIP File

For plugins not in the directory (premium plugins):

1. Go to Plugins → Add New Plugin
2. Click "Upload Plugin" at the top
3. Choose the ZIP file
4. Click "Install Now"
5. Activate after installation

Evaluating Plugins

Before installing any plugin, check these factors:

Must-Check Criteria

Reading the Plugin Page

When you click on a plugin in the directory, check:

• Description — does it do what you need?
• Screenshots — see what it looks like
• FAQ — answers to common questions
• Changelog — history of updates (shows active development)
• Reviews — real user experiences
• Support — resolved vs unresolved threads

Managing Plugins

Activating and Deactivating

• Active plugins run on your site and affect its behavior
• Inactive plugins are installed but not running
• Go to Plugins → Installed Plugins to see all plugins

Updating Plugins

Plugins need regular updates for security fixes and new features:

1. Go to Dashboard → Updates to see available updates
2. Or look for the notification badge on Plugins in the sidebar
3. Select plugins to update → click "Update Plugins"
4. Or enable auto-updates per plugin (Plugins → Installed Plugins → click "Enable auto-updates" next to a plugin)

Auto-Updates

• Recommended for: Security plugins, small utility plugins
• Not recommended for: Major plugins (Elementor, WooCommerce) — these can sometimes cause issues, so update manually and test
• Enable per plugin in the Installed Plugins list

Plugin Best Practices

Do:

• Research before installing — check ratings, reviews, and update history
• Keep plugins updated — outdated plugins are security risks
• Delete inactive plugins — don't leave unused plugins installed
• Test after updating — check your site after plugin updates
• Back up before major updates — especially for critical plugins

Don't:

• Don't install too many plugins — each one adds code and can slow your site
• Don't install plugins from untrusted sources — "nulled" (pirated) premium plugins often contain malware
• Don't install plugins that do the same thing — choose one SEO plugin, one caching plugin, etc.
• Don't ignore update notifications — security patches are critical

How Many Plugins Is Too Many?

There's no magic number, but guidelines:

• 10-20 plugins is normal for a typical business site
• 20-30 is common for feature-rich sites
• 30+ should be reviewed — do you really need all of them?
• It's more about quality than quantity — well-coded plugins have minimal performance impact

Troubleshooting Plugin Issues

Common Problems:

"Site breaks after installing a plugin"

1. Deactivate the plugin
2. If you can't access wp-admin, use FTP/file manager to rename the plugin folder in wp-content/plugins/

"Plugins conflict with each other"

1. Deactivate all plugins
2. Reactivate one at a time to find the conflicting plugin
3. Check if there's an update that fixes the conflict
4. If not, find an alternative plugin

"Site is slow after adding plugins"

1. Use a speed test tool (GTmetrix, Google PageSpeed Insights)
2. Deactivate plugins one at a time and re-test to find the slow one
3. Consider lighter alternatives

Exercises

1. Browse the plugin directory: Go to Plugins → Add New and browse "Popular" and "Recommended" plugins. Read the descriptions of the top 10.

2. Evaluate a plugin: Search for "SEO" and compare the top 3 results. Look at ratings, installations, last updated, and reviews. Which would you choose?

3. Check your installed plugins: Go to Plugins → Installed Plugins. Note which ones are active and inactive. Delete any inactive plugins you don't need.

4. Enable auto-updates: For any security-related plugins, enable auto-updates.

5. Check for updates: Go to Dashboard → Updates and update any plugins that need it.

Key Takeaways

• Plugins add functionality to WordPress — like apps for your site
• Install from Plugins → Add New or upload ZIP files
• Evaluate carefully: check ratings, update date, installations, and reviews
• Keep plugins updated — outdated plugins are security vulnerabilities
• Delete unused plugins — don't leave inactive plugins installed
• Don't over-install — 10-20 plugins is typical, quality matters more than quantity
• Never install "nulled" plugins — they often contain malware
• Test your site after every plugin update

Next Lesson: Lesson 22 - Must-Have Plugins