there will also be 500 mm extension kits for the side beams.

How would the previous sentence be correctly capitalized?
Answer: There will also be 500 mm extension kits for the side beams.
price and availability information is subject to change without notice.

How would the previous sentence be correctly capitalized?
Answer: Price and availability information is subject to change without notice.
if your pc opens the d83 file, but it's the wrong application, you'll need to change your windows registry file association settings. in other words, windows is associating d83 file extensions with the wrong software program.

How would the previous sentence be correctly capitalized?
Answer: If your PC opens the D83 file, but it's the wrong application, you'll need to change your Windows registry file association settings. In other words, Windows is associating D83 file extensions with the wrong software program.
a nice sip of good humor and a carefree toast may give you an unforgettable holiday full of good flavours and genuine emotions.

How would the previous sentence be correctly capitalized?
Answer: A nice sip of good humor and a carefree toast may give you an unforgettable holiday full of good flavours and genuine emotions.