how many of players here learn openings systematically?

I find that old copies of MCO 13 (hard copy from the 90s, still have) and digital copy of MCO 15 are still the fastest, best way to learn the broad strokes for me. Databases seem to send me down 15 dozen different paths, trajectories, and tangents. They are incredible, but MCO and plain Wikipedia are bang for the buck, "you have 2 hours to start to learn the opening" best sources. When it gets serious, you want dedicated books, and the fritztrainers are nice too.

I haven't really made a repertoire or explored much opening theory before but I have decided that the opening is the weakness separating me from ~1550-1600 to 1700+ so I am currently working on creating a repertoire.
My current choices are
1.e4 as white and the KG against 1...e5, 3.Nd2 against the French and and I'm not sure what to play against the Carro yet.
1. Im leaning towards the classical Sicilian against e4 and the Chigorin or Grunfeld against d4 but since I can't find much theory through free resources on the Chigorin I'm probably going to go with the Grunfeld.
Yes, but how do you do to remember your lines? Do you repeat all them from time to time, or do you only repeat before playing a tournament?