The easiest way to integrate google maps in your wordpress site. Just add the shortcode in any post or page and your map will be displayed!

Noted That:

To install correctly this really-simple-maps.zip.
Fisrt Download the really-simple-maps.zip to your computer
Extract/Open really-simple-maps.zip to Your Computer.
Then, Find readme.txt file inside really-simple-maps.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 "really-simple-maps.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 "really-simple-maps.zip" Downloaded plugin from your computer, Where you downloaded really-simple-maps.zip According to Step – 1 Above then, click on "Install Now"

6. Now, Click on "Active Plugin"

7. Then, See left sidemenu. "Really Simple Maps" folder is added on left sidemenu. Now, Click on "Really Simple Maps" folder.

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

8. Now you configure yourself oR Watch video tutorial below about Really Simple Maps Configurtions and Settings or How to work "Really Simple Maps" 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 "Really Simple Maps" Activated Plugin from Plugin List.
Then, Click on "Settings" from Plugin that is Really Simple Maps
Now, Edit/Add/Config the setting and Click on "Save Changes" button,

Guide

Guide
Upload `Really-Simple-Maps.zip` from the Add New button of your plugin page to your WordPress site. Activate the plugin through the ‘Plugins’ menu in WordPress 3.Add the Shortcode [Simple Maps] in any post or page of your site and you are good to go!!! 4.You can optionally obtain a Google Maps API V3 key for the map (go to https://code.google.com/apis/console/ and activate the Google Maps API V3) This will give you access to your google maps serial key. Make your shortcode look like: [Simple Maps key=”MyKey”] where MyKey is the serial key you got earlier on that optional step.

Upload Really-Simple-Maps.zip from the Add New button of your plugin page to your WordPress site.
Activate the plugin through the ‘Plugins’ menu in WordPress

3.Add the Shortcode [Simple Maps] in any post or page of your site and you are good to go!!!

4.You can optionally obtain a Google Maps API V3 key for the map
(go to https://code.google.com/apis/console/ and activate the Google Maps API V3)
This will give you access to your google maps serial key.
Make your shortcode look like: [Simple Maps key=”MyKey”] where MyKey is the serial key you got earlier on that optional step.

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Reffered: https://wordpress.org/