How to tell if a site is wordpress?

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Hello, when I am browsing on the internet I was always wondering if some sites are done in WordPress or built from scratch or something else so is there any way to check for this?
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21:25 (edited)
Hi Fuze. There are few ways how you can tell if a website is based on Wordpress:
1) Open the source code of the website (press CTRL + U), and search there for wp-content -if you will find paths which contain wp-content — it means that the site is on Wordpress
2) Try to add to the end of website domain /wp-login.php — if you will see authorization form — it means that the website is based on WP. Please keep in mind, that some websites for security reasons can change the location of WP dashboard and change authorization page URL.