How do you find G-d? (Talking Parsha - Yitro)

After the revelation on Mt. Sinai, God tells Moshe to teach the Jews about how to build alters. Why are these instructions given now?

Tuvia and Yitzi ,

Tuvia and Yitzi
Tuvia and Yitzi
Talking Parsha

After Am Israel witnesses a revelation no human has ever witnessed on Har Sinai, Hashem tells Moshe to teach Am Yisrael several laws about how Alters should be built. Building an Alter may be important, but why are these list of instructions given now?? Just after witnessing these great moments on Har Sinai...