First, refer to different
1, general: general.
2. usually: usually.
Second, the usage is different.
1, general: generally, universality is usually emphasized, and its basic meaning is "universality, comprehensiveness, generality and wholeness", focusing on everyone or most places.
2. Usually: it is usually a frequency adverb, which means "often" and "habit", which means following the routine, and its regularity is about 90%. Usually, it can only be used as an adverbial, which can be placed before the notional verb, after the copula, auxiliary verb or modal verb, or at the beginning or end of a sentence to express emphasis.
Third, the emphasis is different.
1, general: emphasize the universality of expression.
2. Usually: emphasize frequency.