Trainer
Chords
Bb is a barre chord. Easy sub: play Dm in its place (the tutorial's own alternative), or the small Bb shape shown (strings 1-4 only). F is shown as the easy open F (no full barre).
Strumming
Main pattern (per tutorial): D D U, U D U, played as two halves. Beginners: single down strokes all the way through.
Live chord detection (mic)
Play one chord and let it ring. Works best in a quiet room, phone close to the guitar. Detection only, nothing is recorded or sent.
Chord chart
Format: [Section] lines start a section; a chord line is chords separated by spaces; the next line is its lyric. Lines starting with # are notes.
Seeded from the YouTube tutorial transcript: the tutorial names the chords and the order of the parts, but its captions contain no lyrics. Lyrics are placeholders, and chord placements marked (?) are guesses. Edit them to match the song.