RPD will be collectivity addressing questions related to spell function. Here includes a quick recap of questions answered in regards to spells. You can always learn more by visiting the Mischief Managed wiki and referring to the Catalogue of Books and Tomes. Spell information is detailed on each spell page; example: Catalogue of Books and Tomes > The Standard Book of Spells, Grade Six > Bubble-Head Charm

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No. The Bubble-Head Charm is only intended for the caster. A similar spell is the Ebublio Jinx which is intended for targets rather than the caster themselves.
You can use transfiguration on ebublio, but you would also be transforming the target with the bubble. To escape the bubble you would want to transfig the bubble into something that's easy to break out of, or simply vanish it. Any spells used inside the bubble will impact the bubble, such as using flipendo. Using this inside the bubble would launch the bubble at the target.
Reparifargeis is a spell used to reverse unsuccessful transformations. To reverse a successful transformation you use the same spell, as it works both ways. Example; to reverse object to plant you would use plant to object.
Protego Maxima is not a effective counter during a duel. Protego Maxima will conjure a magical protective barrier to cover the area, spells cast towards it will explode. As the spell takes time to conjure, the spell cast towards you would be within the barrier thus no defense is made and why it is not practical for use in a duel.
No, you cannot transfigure a magical animal into an object.
Finite won't work on transformations, conjurations, and forbidden curses. Finite will neither end confundo as that is a mental state.
Any spell that makes the target DO something, or have an effect on will often wear off. Spells that make alterations won't wear off, and will need a counter spell.
Finite is governed by different factors as previously mentioned however to simplify if Finite is to be used, it would take individual casts.
You can't transfigure a human into another human, however you can transfigure yourself to take on another's appearance. That being said, this is an extremely advanced type of transfiguration.
Bombarda causes whatever it is cast at to explode. Generally, this is not useful on living things however it has the potential to be lethal if someone is close by, and should be used with caution. Bombarda Maxima, however, is more violent and is capable of demolishing walls, again it's not intended to be used on living forms, however, it can still cause injury for anyone close by.