All 6 meanings

1. (auxiliary) should; to be obligated (to do something); ought; shall
2. (auxiliary) to be recommended (to do something); to be asked (to do something)
3. (auxiliary) to be intended (to do something); to be meant (to be something)
4. (auxiliary) to be said (to do something); reportedly; they say that; I hear that; so they say; rumor has it; supposedly.
5. (auxiliary, in a subordinate clause in the simple past tense) would; indicates that the subordinate clause indicates something that would happen in the past but after the time frame of the main clause
6. (auxiliary, in a subordinate clause in the subjunctive) should; indicates that the subordinate clause indicates a hypothetical and unlikely condition for the main clause