Using a Disclaimer on your website will help alert users about important things such as:
- When affiliate links are being used (for example, this type of Disclaimer is required by the Amazon Associates program)
- When health or medical information is being provided
- When legal information is provided
- And so on
Other types of Disclaimers can be more general, such as the "no professional relationship" Disclaimer that's used when providing information to users in certain business markets (i.e. legal, financial) or an "errors and omissions" Disclaimer that simply lets users know that your website may not always be fully perfect and complete.
It doesn't matter what type of platform you're using to host your website, if you self-host it, or even if you just have a simple landing page - a Disclaimer may be required.