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Fine grained commits: Don't commit unrelated changes together with a fix.
Be responsible: Always check what you're committing: make sure you're only committing what you need. Do a svn diff of the files you're going to commit and check the changes.
Never break the build: Do not commit code that would break the compile. Try to build your sources and make sure that you add all the new files before you do a commit.
Document your commit: Always add a message with a meaningful explanation about the commit. If you are fixing a bug, remember to put a link to the bug in Jira.
Committing:
Always mention the JIRA issue that is related to your commit.
Always follow these steps when committing changes:
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The '-' before foo is important. From svn help merge:
unmigrated-wiki-markup{{\-c \ [\-\-change\] arg : the change made by revision ARG (like -r ARG-1:ARG)}}
{{If ARG is negative this is like -r ARG:ARG-1}}