Every WordPress website has one or more themes in it. This theme includes the page structures and the styles which are responsible for the website looks.
The default themes which are shipped with a fresh WordPress installation are mobile responsive. But they're not that fancy and of minimal design and features. 90% of third party free and premium themes currently available on the internet are mobile responsive.
There are thousands of pre-made free WordPress plugins and themes on wordpress.org that you can use for your website’s design. It also has amazing drag and drop page builders like Beaver Builder and Divi which allow you to easily create your own page layouts. There are also premium plugins and themes developed by third party developers which add exclusive features to your website.
WordPress tags have no effect on SEO, or the ranking of a given article. Though they help you organize your posts and let your visitors find out posts based on them.
Hackers aren’t getting in due to vulnerabilities in the latest WordPress core software. Rather, most sites get hacked from entirely preventable issues, like not keeping things updated or using insecure passwords.
WordPress sites generally get hacked for 4 reasons: