You can use a “+” symbol to make simple sub-aliases that all get sent to your normal email. If my email is [email protected] any email sent to [email protected] will be sent to the inbox of [email protected] but the email address is was sent to will be listed at [email protected]. Bitwarden can do this automatically when you generate a login.
If your email alias is ever leaked or gets used for spam you can just block all emails going to that alias.