About song structure
The chorus is the part of a song that "hooks" in your head. It's the part you remember most, because it's the most repetitive.
Verses are the set of lines that are different. When writing a verse you should try and tell a story throughout this section which will eventually develop in the second verse etc.
The bridge is the part of a song that has a different musical "theme". Musically, it typically follows an alternate chord progression known as a key change that "connects" a verse to a chorus or a verse to a verse. When writing the lyrics, just consider the bridge to be another verse.
Tips for writing a chorus: the "HOOK"
Remember, there really is no perfect way to write a song /chorus.
Make the lyrics in the chorus catchy, play some choruses you like and listen to them what makes them catchy.
One of the main rules in writing a good chorus is keep it simple: try to avoid over complicating the chorus.
A chorus is generally 8 bars long or a 4 bars hook repeated.
The chorus should contain elements of the rest of the song.
The bigger and stronger you can make this part the better. The song's chorus is usually the part that sticks in the listener's head: it is the heart of the song.
You can sing or rap in a chorus. e.g a rap chorus on a vocal song or a vocal line on a rap track.
Things to remember
Is the chorus catchy?
What form does it follow? 8 bars, 4 bars repeated?
Singing or rapping, or both?
Contains elements of the song
Title of the song within the chorus