A big online threat now is cryptohijacking. Malware is installed and the resource of either your PC or website used to mine Bitcoin.

Currently, WordPress and websites are been hit hard

I recommend adding cryptohijacking extensions to your browsers. Please keep your computer anti-virus up to date. Please don’t open any attachments of email addresses you don’t recognise.

I recommend the following extensions to your Chrome or Firefox browsers. If you use Internet Explorer, Don’t.

minerBlock by CryptoMineDev
Ghostery – Privacy Ad Blocker

Chrome(if you must)
Avast Online Security 12.0.562 Avast Browser Security and Web Reputation Plugin.
Ghostery – Privacy Ad Blocker Ghostery is a powerful privacy extension. Block ads, stop trackers and speed up websites.
minerBlock 1.1.16 Blocks cryptocurrency miners all over the web.

Update your anti-virus software and use preferably ones that now boast cryptohijacking or Ransomware blocking. If the software offers plugins to your browser then enable them as well as safe search.