sorry to say it but it is a bad tutorial for beginner ( i have seen it tag for beginner)
many thing it involve just tell you to do the thing and does not explain clearly
eg , vector thing (pitch roll yaw if you entirely new to 3d game,i sure you never hear it before ), why perform that kinds of vector operation for the character movement. actually it does not tell you it is vector at all
metasound involve what is execute trigger parameter ? why put the name there and there is no clue in the project