I can't download Burp Suite certificate. When I go on the link,link goes to the weird website
Have you configured your browser to work with Burp Suite? – https://support.portswigger.net/customer/en/portal/articles/1783055-configuring-your-browser-to-work-with-burp
Once the browser is configured you should be able to access http://burp.
Then you can install the CA Certificate – https://support.portswigger.net/customer/en/portal/articles/1783075-installing-burp-s-ca-certificate-in-your-browser
Please let us know if you need any further assistance.