Yahweh is speaking to Moses, so the word "you" is singular. Yahweh probably expected Moses to tell someone else to do the actual work, but Moses would be the one responsible for seeing that the work was done correctly. "Tell a craftsman to make" (See: [[rc://en/ta/man/translate/figs-you]])
# curtains
These were large, heavy sections of woven cloth that were used to form the covering and dividing walls of the tabernacle.
# scarlet wool
wool dyed a deep red color
# craftsman
a person who is skilled in making beautiful objects by hand