Now the following applies to songs that contain some element of narrative. A lot of song writing techniques are genre specific. So for songs with no story this would be less applicable. But even so, still I think of some help.
Now what this is about is, what to write first in the writing process. When you are writing there is a hell of lot to think about at once. Rhyme, meter, story, flow, Prosody, making the chorus work with all the verses, making the bridge work. This can do your head in. And your chances of getting it right are much diminished, if you try to do everything at once.
This is my opinion and while I will give good reasons for writing like this what you do is up to you. It is a matter of personal choice. But this may save you a bit of heartache, or headache.
Write the chorus first.
Because each verse should support the chorus, give it more weight, and each verse must move into the chorus, making sense. If the chorus idea is in your head, unwritten, you have to think about the chorus as you write the verses. This is an unnecessary waste of brain power. If your song idea can not be summed up in a great chorus with a good hook, don't waste energy writing the song, or at least not in verse chorus form because it's a waste of time. Maybe it needs to be in AA form with no chorus. If you have written and honed the chorus, creating hook emphasis, and a catchy rhythm, it may generate ideas for the verses. Also having a completed polished honed chorus done and dusted you can stop thinking about it, which means all your concentration can go to writing other parts of the song. That may just make for a better lyric.
Write the bridge second
Usually the best place to put the why of the song or the pay off is in the bridge. Because if you put it anywhere else it's too early in the song and the interest is not held till the end. The why of the song is the main song idea as opposed to the song hook which is in the chorus. Why are you telling me this, why has this happened etc. sometimes this is a reveal of what the song is actually about. Sometimes called the pay off. The function of the bridge is to get you from chorus two to chorus three. At the same time revealing some extra information about the story. As I say normally the why of the song. So it follows if you think about it you can't write the bridge until you have written the chorus or you are writing a bridge from nowhere to nowhere.
Write the verses last.
Now knowing what the reveal or the pay off is in the bridge and knowing what the summing up or answer to the question is in the chorus, you can now write the verses. Making sure every image in the verses sets up and supports either the chorus and/or the bridge. You can't do this if you don't know what's in them.
So in summary write in this order. Chorus, Bridge, Verses.
It is a lot less work and that has got to be a good thing.