Before each ride I check the tyres are still inflated and the brakes are good before really getting underway, and if there is any obvious damage to the bike.
If you really want to be on top of things you can check everything as suggested by other people, but I ride daily and don't fancy adding 10mins in the garage at 6am before I go to work.
Being a 125 that does a lot of miles I check the oil, coolant, brake fluid, tyres, chain adjustment each weekend, as it particularly loves to stretch the chain and drinks oil. This maintenance schedule has lead to comments from MOT testers about how good a condition the bike is in for the mileage - so daily checks seem excessive to me. 9apps
