Do you want to hide posts that link to certain websites? You can do this with Mastodon Filters:

1. Create a new filter
2. Add domain names of the sites that you don't want to see links to (e.g. example.com), use new keyword for each domain
3. UN-tick box marked "whole word" for each keyword
4. Save filter

If you're not familiar with using filters, there are easy-to-follow step-by-step instructions for creating filters in the guide at:

➡️ fedi.tips/filtering-your-timel

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If you have a fediverse account, you can quote this note from your own instance. Search https://social.growyourown.services/users/FediTips/statuses/116126614252538200 on your instance and quote it. (Note that quoting is not supported in Mastodon.)