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Making branches is an advanced operation.  Ask a knowledgeable individual for advice before doing this for the first time.  After branching to make major changes, make sure to change your IDE / editor to use the branch instead of the trunk.

Making tags is an advanced operation.  Most general users do not need to make tags, and for Maven projects this is done automatically during the release procedures.  Never change a tag once it is made.  Should changes be required, the preferred method is making them in the trunk and then making a new tag.