Its a type of operating system meant to be very secure. If you're familiar with linux its a bit easier to get into.

Website lists their demographic they are looking to reach:

https://www.qubes-os.org/doc/how-to-organize-your-qubes/

nostr:nevent1qqsqxuxzjvpaq5328xx66fd43vj9ssul7xuvrraea6t6cf3wkg3nkyqpz3mhxue69uhhyetvv9ujuerpd46hxtnfdupzphzv6zrv6l89kxpj4h60m5fpz2ycsrfv0c54hjcwdpxqrt8wwlqxqvzqqqqqqyzd4alh