If you are building your own .txt file, a "simple" repertoire usually covers: The easiest way to create an opening repertoire | ChessBase
: This is one of the best sources for digital repertoires. You can find "Keep It Simple" style repertoires by searching the Lichess Study Search for "White Repertoire" or "1.e4 Repertoire." These can be exported as .pgn files, which are plain-text files specifically for chess moves and can be opened in any text editor.
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 (
: A popular modern repertoire that focuses on solid, straightforward lines (like the Rossolimo Sicilian and the Exchange French) rather than deep theoretical battles. Typical Repertoire Structure (for your .txt file)