You can post them to various relevant subreddits (/r/whatsthisbug, /r/mycology, etc). Identification requests are very common and people are receiving them well, so you'll likely to get some answers.

As azeirah writes, subreddits or Facebook groups for people interested in the particular group or location will often help.

For general wild plants and animals (and fungi and everything else) there's a computer vision tool from iNaturalist, which can be used independently [1], or when submitting an observation to the site -- by web browser or in the app. I usually start with that, then look at other observations on iNaturalist and Wikipedia pages for the species.

If the photos are of ornamental plants, I think PlantNet's [2] model is trained on them.

(I work at GBIF[3], where suitable data from iNaturalist[3b] and soon PlantNet is sent, and can then be freely downloaded and used in research etc.)

[1] https://www.inaturalist.org/computer_vision_demo

[2] https://plantnet.org/

[3] https://www.gbif.org/

[3b] https://www.gbif.org/dataset/50c9509d-22c7-4a22-a47d-8c48425...

Not sure what they're called, but there are subreddits for identifying bugs and plants and stuff

Google (or quack) /r/whatisthis and the thing you want to identify. There's a bunch of subreddits like this.

Here's a big list: https://www.reddit.com/r/Whatisthis/wiki/links

This is one of my favorite subreddits. I don’t think I’ve ever even posted in it. It’s like real life Sherlock Holmes sometimes. Quite often people will post a piece of a car involved in a hit and run, and it will be solved in minutes. Or someone will post the oddest looking item, and not only will it get solved, but you’ll learn a bit of background that you never knew.

Inaturalist is a great starting point! What's really funny is I identified a few millipedes on iNaturalist a couple weeks ago and the Twitter poster in this article (Derek Hennen) came along and narrowed it down for me. Very kind and knowledgeable person!

iNaturalist, their license allows your pictures/data to be used in academic research

r/whatsthisbug/