Baroque ornamentation webpage

This webpage put together by Brian Blood is a good point of departure for learning more about ornaments that can be represented by symbols ("essential" ornaments)

There is then also the category of "non-essential" ornaments, which need to be written down as they are to be performed, because they cannot be adequately expressed with symbols alone.

J S Bach: Italian Concerto, Andante, bars 4-6

J G Tromlitz: example of ornamentation analysis