Fix marketing and technical issues before you start sending traffic to a landing page.
Ask multiple people on your team to check for UX issues on the page - on different browsers and devices.
Give each team member specific guidelines to reduce redundancy and repeat observations of the same thing.
For example, one person can deal with different browsers, one can look over the page for copy mistakes and typos, and another can click on everything that is interactive to validate that it works.
This is particularly important if you’re using a duplicate copy of a previous campaign’s landing page.
Run your landing page through a third-party testing tool such as Unbounce Landing Page Analyzer.
Unbounce Landing Page Analyzer looks at many factors of your page’s performance and makes recommendations for how to optimize it.
When someone shares your page on social media platforms, they will render a preview of the page using meta information and images.
If you haven’t set up the social graph tags properly, this can lead to the wrong content being displayed. (Landing page tools can automatically create this for you.)