At a market stall a name may refer to the ingredient everyone nearby expects to buy. Move the conversation to another language or district and that certainty can disappear. The same bundle might be described by its trade name, a Sanskrit name or a word for the part being sold.
Botanical gardens and research collections can preserve a specimen with a scientific name and a record of where it was collected. That gives later readers something to examine if an identification is questioned. A photograph of loose powder on a spoon does not provide the same trail.
For a school project, make a card for a labelled garden plant. Note the name exactly, the institution, the date and which parts you could actually see. Leave space for unknowns. Do not taste a plant to identify it. Learning why an identification is uncertain is a worthwhile result in its own right.
Further reading: Documenting medicinal plant specimens (CCRH)