As a general rule for plants I would suggest users to:
- photograph as many part of a plant as possible including the habit even though this may seem time-consuming. Do not focus only on flowers!
- Collect samples if a plant seems not so rare. A sample allows you to observe a character that could have been missed during an excursion.
- Find manuals and papers that provide taxonomic keys. Learning how to use a key is foundamental.
- Join excursions with more skilled botanists. There are many botanists that are looking forward to share what they know.
Critical taxa may require a peculiar approach (e.g Rosa and Orobancheae):
https://www.inaturalist.org/journal/blue_celery/23520-phelipanche-nana-vs-ramosa-vs-mutelii
https://www.inaturalist.org/journal/blue_celery/21213-european-broomrapes-how-to-ask-for-an-identification
https://www.inaturalist.org/journal/blue_celery/16338-wild-roses-of-the-euromediterranean-area-how-to-identify-them
https://www.inaturalist.org/journal/blue_celery/16172-anagallis-foemina-vs-anagallis-arvensis
https://www.inaturalist.org/journal/blue_celery/14150-fumitories-of-north-america
https://www.inaturalist.org/journal/blue_celery/13850-ornithogalum-umbellatum-vs-o-divergens-iconography-and-key-for-their-identification