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Mainly: reacts with acid to form salt and water? , reacts with water to form bases, and reacts with acidic oxides to form salts.

React with acid to form salt and water? :

Na20+2HCl=H20+2NaCl

Reacts with water to form a base:

Na20+H20=2NaOH

Reacts with acid oxides to form a salt:

Na2O+CO2==Na2CO3

Some of the amphoteric oxides can react with strong bases, such as Al2O3 (aluminum oxide)

Al2O3+2NaOH=2NaAlO2+H2O

Please follow up if you have any questions.