You should definitely know about this Come and see guys

Our website is at risk of being infected by viruses and hackers

Look carefully at the address letters menu and URL

Lock image and 'S' symbol are required

You need to keep your admin passwords very secure

check the Email address, phone, Address, live chat etc.

Double check the name  Ex..GooGle.com

Next,  look at the domain page, spelling mistakes

Use the google search console and Google analytics to view your site performance report

Verify the website privacy policy Run a virus scan You can validate the site with google safe browser

Ads that take up the whole page Ads that redirect you to another page Explicit of ads 

These free tools will be useful for you

https://transparencyreport.google.com/safe-browsing/search

http://www.isithacked.com/

https://whois.domaintools.com/

Do your search ? Check reputation of the site