Something I wish I had known sooner back in my film days is that you want to match the contrast of your film to the shooting light and conditions.
Back in the day...
Velvia 50 for magic hour or mid day overcast
Provia 100F for early morning/late afternoon sunny, or broken clouds day
Astia for mid day sunny (and reliable, if not dramatic, for the rest)
Kodak Supra 100/400 for sunny day (this was a short lived but great film, scanned well)
Fuji Reala, like Astia, was rather reliable under a range of conditions, if a bit dull under overcast
Unfortunately three of those are gone.