Applying to grants

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• A supporter is asking for our tax ID or employer identification number (EIN). What is this / where can I find it?
• What is fiscal sponsorship? How is it different from 501c3 status? How is HCB unique as a fiscal sponsor?
• What is Hack Club's address?
• What do I do if a donor is asking me to fill out a W9?
• Where can I find a 990 form?