Should we ask questions about other development tools used in parallel with Sitecore here? I have sent a question to the slack community about some issues with Git and serialization files. It's not strictly a Sitecore question, but it is still related. Should we post these sort of questions here? I have read this questions, but I'm still not sure.
If your question is directly related to Sitecore, e.g. it is about working with Serialization of Sitecore Items and working with Git/TFS/VCS, then it a valid question for this StackExchange.
If the question is about general files and working with Git then it would be better asked on StackOverflow or the appropriate StackExchange site.
On other *.SE sites it's common practice to allow free 3rd party tools questions, but not paid-for 3rd party tools questions. The reason is that paid for tools often have a support organization/community themselves and which should be cared for for those who have bought the tool.
The Sitecore community and Sitecore itself rely on 3rd party tools which differs from other frameworks. Learning this, it's probably better to allow 3rd party questions and answers in sitecore.stackexchange.com too.