By a (national) Citizen Science Project run by a NGO- the NABU Naturgucker Akademie, there is website full of resources (free courses and talks) about nature observation and introductions into many species groups can be found here: https://artenwissen.online/goto_naturgucker_root_1.html
The focus is on Germany and the website is in German, but the introductions to species groups are relevant in other regions, too. You have to register, but the courses are all for free (Governmentally subsidised).The talks are ongoing, you can listen to old ones but also join live.