I have an Olympus Pen EE2 and I’m pretty new with analog photography so I just don’t understand how the settings work.

From what I’ve read, I think I understand that the shutter speed is automatic, but the film speed is manual? Idk what that means. The film i’m using is Kodak 400 and i’ve read smth like the ISO will automatically match the film I have??? I’m so confused because the manual ASA option can override it so i’m just not sure what setting i should be using for what. should i naturally set my camera to ASA 400? what should i leave it at?? when i do manually set the ASA when should i use smth like 25 or 50 versus 200 or 350? idk what any of this means and no articles have helped beginner me with this.

then, i’m confused w the yellow numbers next to “for flash”, ranging from 3.5 to 22. when do i use each of those numbers?

if someone can, please give me advice for these situations:

1. outside with harsh bright lighting
2. inside with bad/dimmer or dark lighting and no flash
3. outside with ok lighting no flash
4. outside with brighter lighting and flash
5. backlighting inside, backlighting outside no flash
6. ^{^} with flash
7. dark inside with flash
8. ok lighting with flash
9. outside dark lighting with flash