Based on how this was asked, I assume you’re using a shared hosting provider that is asking you for these items. If so, you would probably need to use something like https://zerossl.com to obtain and send these along. However, this is not ideal as you will need to repeat the process every few months. This is because Let’s Encrypt certificates expire every 90 days. You might want to consider moving to a host that supports Let’s Encrypt automatically, such as those on this community-maintained list: Web Hosting who support Let’s Encrypt
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