question: 2 focus wing ds/external corner (incl. in external corner kit, see installation guide)
Capitalize this past sentence correctly.
A: 2 Focus Wing Ds/external corner (incl. in external corner kit, see installation guide)

question: the good news is that the visual editor does not screw up your div tags by replacing them with p tags. however, it does remove any tags [...]
Capitalize this past sentence correctly.
A: The good news is that the Visual editor does NOT screw up your DIV tags by replacing them with P tags. However, it does remove any tags [...]

question: the german forces were far stronger than the french had imagined and soon the french army was in retreat.
Capitalize this past sentence correctly.
A: The German forces were far stronger than the French had imagined and soon the French army was in retreat.