Type in a command, or "ls dictionary" to search all commands for "dictionary", etc.
man https://www.ar15handguard.com/ar10-308-handguard
No manual entry for https://www.ar15handguard.com/ar10-308-handguard.
To search for "https://www.ar15handguard.com/ar10-308-handguard", try typing
ls https://www.ar15handguard.com/ar10-308-handguard
.