Hello Antonio,
There isn't a 'Royal Guards', but you may be referring to The Guards, who are Infantry.
There are great pages on the Army Jobs website that can tell you about who the Guards are and what they do: Serve with the Guards in the Infantry | Army Jobs
If you're interested in wider Infantry roles, have a look at this page: Be the Nation's Frontline - Infantry Roles | Army Jobs
If you were after more specific information, please feel welcome to reply with further questions.
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