Advent of Code is an advent calendar of programming puzzles designed for a variety of skill sets and levels. You can use any programming language you like (You can even use different languages for each problem). What matters most is getting the correct answer for the puzzle.
Run npm run createday for a template for the current date or do npm run createday -- <day count> for a specific date. Note that the integer must be between 1-25 for the template.
Create an inputs folder and place each input as Day{Day count}.txt. Then, run the program using npm run launch -- "day{Day count}"/{part1 or part2}.