Amajor connection for sugars in glycolysis is
glucose-6-phosphate
fructose-1,6-bisphosphate
dihydroxyacetone phosphate
phosphoenolpyruvate

glucose-6-phosphate

Explanation:

Glycolysis is metabolic pathway which converts glucose into pyruvate. The energy released from the process is used to form high-energy molecules known as ATP and NADH.

Glycolysis is the sequence of ten reactions which are enzyme-catalyzed.

Sugars are majorly connected to glucose-6-phosphate which is formed from the phosphorylation of the glucose units.

Fructose-1,6-bisphosphate , dihydroxyacetone phosphate  and phosphoenolpyruvate are further produced or used in the process and hence are not linked directly to sugars.