You might find the Apple weather app is often incorrect. Plenty of other options. Personally I’ve been using carrot weather.
That hugely depends on your region. I find it pretty good here in the UK. Also, there’s a report feature where you can report the current weather conditions to improve their prediction model.
I gave up after two years of reporting it. It would say there’s not a cloud in the sky when it’s raining. Not to mention there are plenty of Apple employees where I live, so undoubtedly they are aware of how lousy it is.
I like copilot for finance tracking.
Carrot is a solid weather app, flighty for flight tracking. I heard Halide is nice for photography.
Grab the shortcuts app for some awesome automation things.
Shortcut seems really, really interesting
AppRaven. It lets you “watch” apps’ prices and will notify you when an app (or IAP) goes on sale.
Keep in mind that you are not locked into the apple ecosystem for a lot of things. So if you’re used to working with Google drive or Dropbox, there are apps for that on iOS as well. Personally I’m using Instapaper instead of Safari’s “reading list” feature because it works across multiple devices and operating systems.
There’s also an iCloud app for Windows and a web-based interface for iCloud if you ever need to access your stuff there on a non-Apple device.