Using Content in Portfolio

hey yall! i’m working on creating a reel right now and truthfully, don’t have much ‘technical’ or even ‘commercial’ editing i’ve done yet to be able to splice into the reel in some ways so i was basically gonna start from scratch. the work i have done have just been silly edits of shows i like. but with this question of starting from scratch, what is the culture like around using copyrighted brand names to create a ‘fake ad’ or something along those lines? i have so many ideas but i didn’t know if i should veer myself away from copyrighted content or if it’s okay to use?

for more context i have this idea for a “commercial” for nerds candy. i want to make it and add it to my portfolio. is that okay to do despite me never being commissioned or payed by nerds to do something like that?

just wondering! thanks for the help yall!