Is there a guide for when & how to add specific ingredients to the fermentation process?
For example, if I want honey, lemon, ginger, banana, raspberry, etc. - when's the best time to add that ingredient?
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I am not aware of such a guide, and I believe I would know if an authoritative guide existed.
Opinions vary on each of these items, as it is a matter of what sort of aroma, flavor, or effect you are looking to achieve with any addition, as well as personal taste. For example, honey may be added to add sugar or for its flavor.
Randy Mosher is a noted expert on adding spices, fruits, and other adjuncts to beer, and he has published a book called "Radical Brewing" that contains many useful tables. He also has published numerous articles on related beer additions, many of which are legally published for free online. Other sources, such as Brew Your Own magazine, have published numerous guides and spreadsheets over the years covering portions of the universe of beer additions.
Otherwise, I recommend searching for the particular item you wish to add, and then posting a question if that question has not been answered.