maybecoooked no lmao so basically what i've been working on is a high tech turtle nest protector and it's still a work in progress, but essentially what I did was create a poster outlining what it is, how it works, future improvements etc., along with a photo of my prototype and a diagram of what the end goal is for it to be like. i would highly recommend you pursue something like this or do some sort of research/in depth experiment and do a write up on it.
if you want to make posters then yess go ahead absolutely, but don't just make one general one like you'd find in a random classroom and put it on your resume. if you can, go into a detailed description of a really niche topic (e.g. cymatics, echolocation in primate species, etc.) and make posters about that. but make sure it's a topic that you actually love to death and genuinely want to be very overeducated in it. starting a blog and adding all your research and projects into that and giving the link in your resume would be great (this is what i did). but just keep in mind there's a high chance they won't look at it. hope this helps