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I've been using the same setup for several years now. I purchased my own domain, and have Fastmail do all the email hosting for me. Super simple. I also forward my gmail to my custom domain email, because I was only able to transition about 95% of my various services to my new email.

I use the same setup, had to contact Fastmail support once during the initial week of transferring from gmail. Support response was quick and professional.

Can you use fast mail with any email service that supports IMAP or is it like Proton Mail where you have to use their app to check your emails?

FastMail offers seneric JMAP, IMAP, and SMTP access with app-specific passwords.

Thanks! And what about using a Fastmail calendar? For example, can I receive a calendar invite from someone, accept the invitation in my email, and have it automatically show up in my calendar app of choice (e.g. iOS calendar)?

That's another thing where Proton makes me use their app, which can be annoying.