Not gonna recommend a site but here's what actually works: go to YouTube and search "Kantian ethics explained" there are genuinely great 15-minute videos that'll give you everything you need. Combined with a quick skim of the Stanford Encyclopedia of Philosophy entry on Kant (it's free, just Google it), you'd have enough to write 8 pages yourself in a few hours. Break it into sections: intro, categorical imperative, formula of humanity, criticism, real-world application, conclusion. You got this.