garden room (18-20 people capacity) can be used as a training room or for crafts and similar activities.

How would the previous sentence be correctly capitalized?
Answer: Garden Room (18-20 people capacity) can be used as a training room or for crafts and similar activities.
this phenomenon has become so popular that many bosses and business owners, think, how to deal with it.

How would the previous sentence be correctly capitalized?
Answer: This phenomenon has become so popular that many bosses and business owners, think, how to deal with it.
diver's lifeline with a cable for video and data (e.g. for a depth sensor) and a separate communication cable.

How would the previous sentence be correctly capitalized?
Answer: Diver's lifeline with a cable for video and data (e.g. for a depth sensor) and a separate communication cable.
this seat can be sprayed on the expansion into a different water spray and different gases.

How would the previous sentence be correctly capitalized?
Answer: This seat can be sprayed on the expansion into a different water spray and different gases.