Introduction 

Google Webmaster Tools (GWT) is free software that helps you manage the technical side of your website. The tools are indispensable for SEOs, especially since the various diagnostic reports give straight-from-the-horse’s-mouth insight on everything from broken pages to link penalties. Want to know why your pages can’t be found through search? GWT is a great place to start looking for answers. It’s also Google’s hotline to communicate with website owners. So if any issues or penalties occur with your site, those crucial messages will come to you through Google Webmaster Tools.

To check out more about the benfities of using Google search console, check this link.

Steps

First, Sign in to Your Google Account

Before you can set up Google Webmaster Tools, Google wants to know who you are. So step 1 is to sign in to your Google account (such as Gmail or Google+).

If you don’t have a Google account yet, go to Google.com and click “You.” Then click “Create an account” and enter your information. (As a bonus, this one-time setup also gives you access to Gmail and other G- applications.)
Google Signin

Set up a Google Webmaster Tools Account

Once you’re signed in to a Google account, go to:

In the Add a site pop-up window, type in your website’s base URL (ending with .com, .org or other). Then click “Continue.” Type in URL

Type in URL

Next, you have to verify that you are the site owner. There are several ways to do this. Click the “Alternate methods” tab to see them all.
Verify Site Ownership

Verify Site Ownership

Method 1: If your website has Google Analytics (and you have “administrator” permission), verifying your ownership will be a snap. Here’s how:

Select the radio button next to “Google Analytics.”
Click the Verify button. That’s it! Your GWT account is ready to go.
Verify Method 1

Verify Method 1

If you DON’T have Google Analytics set up, choose one of these three methods to verify your site instead:

Method 2: Select the “HTML tag” option if you have the ability to edit your website’s HTML code. Highlight and copy the text Google displays (starting with <meta name=…). Next, open your home page in a website editor, paste the new Meta tag into the <head> section, and save your changes.You can add to your store head from:System> Configuration > Design > HTML Head > then copy and paste it in the “Miscellaneous Scripts” field.

Then click the Verify button to finish your Google Webmaster Tools setup. (Note: Leave the new tag on your home page.)
Verify Method 2

Verify Method 2

Method 3: Try the “Domain name provider” option if you can’t do the first two methods. Drop down the list and select the company where you registered the domain. Follow the instructions given. Then click the Verify button to finish.
Verify Method 3

Verify Method 3

Method 4: The fourth method is for people who have a Google Tag Manager account and “manage” permission.

Once you have been verified as the site owner, your Webmaster Tools account should be ready for use.

Note: You may have to wait a few days for data to be available if this is a new account. 

Outcome

To use your new tools, just visit http://www.google.com/webmasters/tools/ and sign in. Click “Manage site” next to your domain and start exploring the many useful tools and reports.

Disclaimer

As we are discussing a third party topic, we’ve used most of the content in this article form Google’s resources articles, that talks about Google webmaster tool.