If you are looking for a "low maintenance" repertoire to copy into a text file, consider these "system-based" openings: : Characterized by followed by Bf4cap B f 4 . It is famous for its "triangle" pawn structure (
If you are building your own .txt file, a "simple" repertoire usually covers: The easiest way to create an opening repertoire | ChessBase Download Simple Chess Opening Repertoire for White txt
: You can find older, digitized versions of classic repertoire books like Watson's Strategic Repertoire or Alburt's Chess Openings for White for free borrowing and digital reading. If you are looking for a "low maintenance"