The oxidation reaction in junior high school is that the reaction that obtains oxygen is an oxidation reaction, and the reaction that loses oxygen is a reduction reaction.
In the reaction between silicon oxide and carbon, silicon loses oxygen, so it is a reduction reaction. This is from the perspective of silicon, but from the perspective of carbon, carbon gains oxygen, which is an oxidation reaction. Both statements are actually correct. But we generally call this reaction in junior high school a reduction reaction!
Displacement reaction is a reaction in which one element and one compound react to form another element and compound.
The reactants are one element and one compound. In the product, the original element in the reactant becomes the corresponding compound, and the original compound becomes the corresponding element!