Rashi on Exodus 30:9/רש"י על שמות ל׳:ט׳

1לא תעלו עליו YE SHALL NOT OFFER ON IT — on it, i. e. on this altar, but you may offer on the copper altar (cf. Menachot 50b),

2קטרת זרה STRANGE INCENSE — any incense brought as a freewill offering; all of them (all offerings of incense) are “strange” to it (to the altar) except this prescribed here.

3ועלה ומנחה means, nor burnt offering nor meal-offering. The עולה is an offering of an animal or bird; מנחה is one of bread.