Using a Karnaugh map, reduce the following equations to a mini- mum form.

I am having quite a difficult time with this problem. Can someone please assist me with the below as I do not know what I am doing. :(

Using a Karnaugh map, reduce the following equations to a mini-mum form.(a) W = B(CD + AD) + BC(A + AD)(b) X = ABD + B(CD + ACD) + ABD(c) Y = A(CD + CD) + ABD + ABCD(d) Z = BCD + BCD + CD + CD(B + AB)