Understanding the construction of a song can really help with the writing process.
A typical song consists of a few key components: verse, pre-chorus (sometimes), chorus, and a bridge.
I like to think of each part of a song as a body part, making up one body. It should all go together.
The verse should “fit” well with the chorus. If it doesn’t, you may find you are actually writing two different songs.
This has happened to me more than once. I had a chorus I liked and verses I liked but they simply were not fit for each other.
On the other hand, if they do fit together, keep the flow going!
The verses should be similar yet not identical. Repetition is great to get the listener humming along, and is common in those big commercial songs.
However, you should try slight variations so no two parts are identical. This will keep the interest alive.
The chorus is obviously the center of the song where the theme is fully expressed.
The bridge is called a bridge for a reason: it connects the other parts of the song and usually prepares for the final chorus.
I started writing way before I learned anything technical about songwriting, yet my songs still consisted of all those components.
Chances are, if you listen to music, you can pick all this up quickly too.
So start building!