There's always a huge amount of info available on using the software, known issues, and the content of updates.
Using this info is your best starting point.
Crashes are generally caught by Talkback (like Microsoft's Online Crash Reporting).
Please click OK to send those reports to us — it's quick and painless, and helps us to fix the problem quickly.
Not all bugs cause crashes, though. For those that don't, please get in contact with as much detail as possible.
Support is provided using this contact form.
Please provide as much detail of the problem as possible, including the platform you're using.