welcome to rappler, a social news network where stories inspire community engagement and digitally fuelled actions for social change.

How would the previous sentence be correctly capitalized?
Answer: Welcome to Rappler, a social news network where stories inspire community engagement and digitally fuelled actions for social change.
unknowingly erased a large sized file, which failed to get stored in the recycle bin

How would the previous sentence be correctly capitalized?
Answer: Unknowingly erased a large sized file, which failed to get stored in the Recycle Bin
downloadable from hacking discussion boards for free, the trojan development kit (tdk) apps comes with an easy to use interface that allows criminals to quickly create their own ransomware, say researchers who recently spotted the appearance of this particular diy ransomware kit.

How would the previous sentence be correctly capitalized?
Answer: Downloadable from hacking discussion boards for free, the Trojan Development Kit (TDK) apps comes with an easy to use interface that allows criminals to quickly create their own ransomware, say researchers who recently spotted the appearance of this particular DIY ransomware kit.
almost half the eu member states have chosen not to develop nuclear power.

How would the previous sentence be correctly capitalized?
Answer: Almost half the EU member states have chosen not to develop nuclear power.