Some of your basic toolkit are the spares.
I usually have spare
Brake cables
Gear cables
Ferrules
M5 bolts
Cleat bolts
Chain
Cassette
Middle chain ring
Tyre
Coax wire and spade connectors for the Dynamo wiring
Plus
A work stand
Track pump
Bottom bracket tool
Spare rags
Mechanic gloves, pack of 100
Electrical tape
Cassette tool
Proper beefy Park Chain Tool