Create custom shortcodes and reusable content and insert them in into your posts and pages.

Noted That:

To install correctly this post-snippets.zip.
Fisrt Download the post-snippets.zip to your computer
Extract/Open post-snippets.zip to Your Computer.
Then, Find readme.txt file inside post-snippets.zip and Open readme.txt.
Now, Read the Requirements of this plugin. Which Wordpress Version and PHP Version are required to run this Plugin in Your Wordpress Site.
Then, Follow the the Tips Below.

Start the Tips:

1. First Download "post-snippets.zip" Plugin to your Local Computer. (Click Download)

2. Then, Login to your "yourdomain.com/wp-admin" Dashboard.

3. Then, Click on "Plugins" + "Add New" from left sidemenu of Dashboard.

4. Now, Click on "Upload Plugin" button.

5. Now, Browse "post-snippets.zip" Downloaded plugin from your computer, Where you downloaded post-snippets.zip According to Step – 1 Above then, click on "Install Now"

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Post Snippets" folder is added on left sidemenu. Now, Click on "Post Snippets" folder.

Noted that: If you do not see "Post Snippets" folder on left sidemenu then, see at left sidemenu "Settings" or "Tools".

8. Now you configure yourself oR Watch video tutorial below about Post Snippets Configurtions and Settings or How to work "Post Snippets" in your WordPress site.

After Activated Plugin According to Step-6 then,

Go to "Plugins" + "Installed Plugin" from Wordpress Admin Panel Leftside Menu.
or Direct go to: https://yourdomain/wp-admin/plugins.php
Then, Find "Post Snippets" Activated Plugin from Plugin List.
Then, Click on "Settings" from Plugin that is Post Snippets
Now, Edit/Add/Config the setting and Click on "Save Changes" button,

Guide

Guide
Requirements PHP version 5.3.0 or greater. WordPress version 3.3 or greater. Automatic installation Install the plugin via Plugins > New plugin. Search for ‘Post Snippets’. Activate the ‘Post Snippets’ plugin through the ‘Plugins’ menu in WordPress. Go to Settings > Post Snippets and start entering your snippets. Manual installation Unpack the downloaded package Unzip and upload the directory ‘post-snippets’ to the `/wp-content/plugins/` directory Activate the ‘Post Snippets’ plugin through the ‘Plugins’ menu in WordPress Go to Settings > Post Snippets and start entering your snippets. Uninstall Deactivate Post Snippets in the ‘Plugins’ menu in WordPress. Select Post Snippets in the ‘Recently Active Plugins’ section and select ‘Delete’ from the ‘Bulk Actions’ drop down menu. This will delete all the plugin files from the server as well as erasing all options the plugin has stored in the database.

Requirements

PHP version 5.3.0 or greater.
WordPress version 3.3 or greater.

Automatic installation

Install the plugin via Plugins > New plugin. Search for ‘Post Snippets’.
Activate the ‘Post Snippets’ plugin through the ‘Plugins’ menu in WordPress.
Go to Settings > Post Snippets and start entering your snippets.

Manual installation

Unpack the downloaded package
Unzip and upload the directory ‘post-snippets’ to the /wp-content/plugins/ directory
Activate the ‘Post Snippets’ plugin through the ‘Plugins’ menu in WordPress
Go to Settings > Post Snippets and start entering your snippets.

Uninstall

Deactivate Post Snippets in the ‘Plugins’ menu in WordPress.
Select Post Snippets in the ‘Recently Active Plugins’ section and select
‘Delete’ from the ‘Bulk Actions’ drop down menu.
This will delete all the plugin files from the server as well as erasing all
options the plugin has stored in the database.

into, your, posts, pages, them, insert, custom, shortcodes, reusable, content,

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Reffered: https://wordpress.org/