When you first become aware of the job advert
How did you hear about the job? Was it through a genuine job site, on social media, by a direct message on LinkedIn, or in an email from a previously unknown recruiter or company?
If you found the job advert on a job board or through the website of a recruitment company, then there's a good chance that the advert is genuine. However, more investigation is required to make sure.
If you saw the job advertised on a company's social media channels, the likelihood that this is fake or a scam is totally reliant on the employer. Is this a genuine company? One good way to find out is to look for an online presence beyond social media, such as a website and a registered address. You might also like to check whether the company is registered with Companies House.
If you received a direct message from a recruiter or other individual, handle with care. It's common practice for recruiters to send direct messages to people they are already connected to on LinkedIn or request a connection and attach a message. Unfortunately, this also makes it easy for scammers to pose as recruiters and drop you a line.
If you receive an email from someone who claims to be recruiting, do not click on any of the links without checking them first. Hover over the link to find out whether its destination matches with the URL it claims to lead to. Have a look at the email address of the sender. Does it look like a genuine company email, for instance, johnsmith@harringtons.co.uk, or is it a string of numbers and letters and possibly a Gmail, Hotmail, or Outlook account, like this, 4aps22@gmail.com? Is the email well-written or full of spelling mistakes and typos?