debconf is a conference with, by and for debian developers, maintainers and contributors. non-developers are quite welcome to attend as well, but are not the conference's primary audience.

How would the previous sentence be correctly capitalized?
Answer: DebConf is a conference with, by and for Debian Developers, Maintainers and Contributors. Non-developers are quite welcome to attend as well, but are not the conference's primary audience.
* some da file extension formats can be opened in binary format only.

How would the previous sentence be correctly capitalized?
Answer: * Some DA file extension formats can be opened in binary format only.
in connection with each kitchen is a utility roomwith a sink where you e.g. can hang your laundry to dry.

How would the previous sentence be correctly capitalized?
Answer: In connection with each kitchen is a utility roomwith a sink where you e.g. can hang your laundry to dry.
the germans begin the persecution of undesirable people.

How would the previous sentence be correctly capitalized?
Answer: The Germans begin the persecution of undesirable people.