Because TortoiseSVN is being developed all the time it is sometimes hard to keep the documentation completely up to date. We maintain an online FAQ which contains a selection of the questions we are asked the most on the TortoiseSVN mailing lists https://groups.google.com/forum/#!forum/tortoisesvn and https://groups.google.com/forum/#!forum/tortoisesvn-dev
If you have a question which is not answered anywhere else, the best place to ask it is on one of the mailing lists:
https://groups.google.com/forum/#!forum/tortoisesvn is the one to use if you have questions about using TortoiseSVN.
If you want to help out with the development of TortoiseSVN, then you should take part in discussions on https://groups.google.com/forum/#!forum/tortoisesvn-dev