Hello
I want to get a free 90-day certificate for testing for Mikrotik and I just met this site.
Please guide me how to prepare
Many thanks
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Hi @Arash99, and welcome to the LE community forum 
Start here:
Getting Started - Let's Encrypt (letsencrypt.org)
Then if you still have questions, first search this forum for previous answers to similar questions before asking for help here.
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