Hi, this is a late response, but I recently got started in immunology as well. Here are a few resources I really liked:
- The Fundamentals of Immunology Cousera specialization (available for free). Fantastic. It's straightforward, I think, and the professor is really funny. I was able to complete it without too much difficulty (although there is some basic biology knowledge required). I completed AP biology and part of a college introductory biology class before I started this online course.
- I watched Crash Course and then this video series. Crash Course was super understandable to me, the lecture series was not. The lectures were much more comprehensive, so it was well worth listening to in my opinion.
- I browsed/briefly watched sections of Libretext (1), Stories of Infection, and random videos I found online. The Libretext was helpful for reinforcing my general understanding of the immune system. Stories of Infection was interesting, but I felt like it didn't teach me anything new.
- I am currently working through the Pillars of Immunology, a list of articles about important discoveries/concepts to the field. This is also outside of my current understanding, haha, but I think I'm starting to accept that there will always be new things to learn and feel excited about.
That's everything I've used so far. I think the main thing I'm missing is a really comprehensive immunology textbook, but I have neither the money or the ability to leave my house and go borrow one. I'm hoping to get it from my college library when we get back to campus (fingers crossed). Still, I hope this helps!