Please capitalize where necessary: it saves money, by making us use energy more efficiently (more for less).
A: It saves money, by making us use energy more efficiently (more for less).

Please capitalize where necessary: the samsung galaxy s9 and galaxy s9 plus are also the first samsung devices with built-in band 14 access.
A: The Samsung Galaxy S9 and Galaxy S9 Plus are also the first Samsung devices with built-in Band 14 access.

Please capitalize where necessary: i am a woman, 42 years old, seeking a man age from 30 till 50
A: I am a woman, 42 years old, seeking a man age from 30 till 50

Please capitalize where necessary: we gather certain information automatically and store it in log files.
A:
We gather certain information automatically and store it in log files.