Backlinks are your website link on another website outside of yours, eg: lets say there was a Graphic Design company called: Great Graphics, and we approached them (healy web design) asking them for a post submission or mention where our link (https://healywebdesign.co.uk) gets mentioned and linked on their website (onto Great Graphics website)
How to build great backlinks
There’s a myriad of ways to build links, but there is no ‘quick win’, as links should always be the result of fantastic content created for the user, not the search engines. It can be helpful to create a content plan for your own website and then look at how this fresh content could be leveraged for links from a trusted source.
Let’s imagine you are a travel website; you could create a well-designed resource for the different documentation requirements for visiting all major countries. Once hosted on your site, you could get in touch with legitimate travel blogs to alert them to the fact this is available to their users if they link to it. Offer to write a bespoke introduction to the content so it’s even easier for them to add the link to their website (never duplicate this, as you’ll run into duplicate content issues quickly, it must always be unique).