Advice on first bike for exercise

I am looking at getting into cycling for exercise. Looking to mostly ride on paved roads/paved bike trails.

I don't know anything about bikes so any advice is appreciated.

I'm looking at these two bikes on FB marketplace

First one:
Fuji Road Bike priced $435
-Frame: M/L or 56 cm good for between 5’8-6’1
-Shimano 105 components
-Model: Two.0
-Beautiful color
-Carbon Fork

Second one:

White Trek FX 7.4 20” bike – individually priced $375.00