I work for the IT department of a big company with lots of applications. Usually my day starts managing custom apps, most of which I barely know, and fixing single problems on them. The problem is: for each problem on a different application the startup time is high and my effectiveness in resolving the problem could be better if I knew better the application itself.
Are there techniques (better if established ones) to understand a big ecosystem of software and learn the most important parts of it both from an IT and operational point of view?
Is there some software which can help me in the process? (eg in the task of discovering, organizing information...)