Acid salt defines that cations (easy to lose electrons) generated during ionization include hydrogen ions (with the properties of metal ions) in addition to metal ions or NH4+, and anions (easy to gain electrons) are salts of acid ions.

Definition of basic salt: Anions generated during ionization include hydroxide ions in addition to acid ions, and cations are salts of metal ions (or NH4+).

Difference: See if there are any extra H+ or OH-

NaHSO4 acid salt, Cu2(OH)2CO3 basic salt.

Be careful not to treat some hydrogen in other groups as H+, NH4Cl salt and CH3COONa salt.