Actually, there are technically six powers that Congress can not do, but only four of them are still relevant today. The four relevant prohibited powers are....
1) Habeus Corpus. This prevents Congress from passing laws that remove the protections of people who have been accused of crimes.
2) Ex Post Facto and Bill of Attainder Laws. Basically, Congress can't make something illegal after its already been done, nor can they create laws specifically aimed at certain groups of people.
3) Prohibits Congress from making laws discriminating against states or religions.
4) Congress can't create laws regarding specific states and their export taxes.
The other two clauses are...
5) Congress can not regulate slave trade. This became irrelevant after the year 1808.
6) Congress can not impose or create direct taxes on something.
HOPES THIS INFORMATION HELPS! <3
