Forget about shaving weight off the bike it weighs only 9.2 kg (20.2 lbs) on the other hand you weigh 96 kg (211 lbs). It might cost $500 USD or more, way more, to shave 1 kg from your bike. With diligence you could drop 1/2 kg a week (about 3000 calories). Just keep riding and eating smart and the kgs will melt off at no cost.
But to answer your question: fork, stem, handlebar, seat and wheels although at your weight I wouldn't go for light wheels.
Enrty level bike isn't worth the tweaks. You have a decent enough setup right now. Lose some poundage, train harder and in a year reward yourself with a nicer bike. A few grams or even a pound on the bike ain't gonna make much difference when you can lose 5 pounds easily.