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So the 5 things you should learn are:
1- Learn what's the key of a song: The key of the song is where all the melodies and harmonies of the song belong, so every note you'll play in that song will have to belong to that key you've chosen to your song.
2- Expend your chord vocabulary: Chords are what western harmony all about, learn as much as you can in order to give your songs a special flavor.
3- Learn some scales and modes: Scales and modes are very important in songwriting, because they are played along chords, they are used to create melodies or solos.
4- Learn chord progressions: Chord progressions are very important in songwriting, because you can't just play a chords sequence like that, you have to chose the strong progressions and even some of the medium ones to make your song enjoyable by your listener's ears.
5- You have to learn writing song lyrics properly: song lyrics are very important because they are what most normal people understand (words!!!), so make sure you pick them well.
These are the basics that you're going to learn in order to write good songs, and with the songwriting techniques i'm going to teach you, you'll be an invincible songwriter.