When any vehicle won't start, you have to determine if the problem is gas or ignition. An easy way is to pull a spark plug. You might have to pull all the plugs. If the plug is wet, you are getting gas. If not, check for fuel, petcock turned on, vacuum line to petcock connected, fuel pump humming, and choke on or off.
Lay a plug on the block and crank. No spark? On the new bikes, it's probably a relay like the kickstand, clutch lever, or emergency stop switch. Basically, there are three problems: opens, shorts and grounds. Open could be a broken wire or switch turned to off. Short is when current flows directly to ground. A blown fuse indicates a short in the line. A ground is similar to a short, but is on the ground side; such as a horn that blows continuously.
With less than $20 in tools, you can check your wiring. A 12-volt test light can be used to search for voltage. The key has to be on, but the bike should not be running. With the clip to ground, touch the point to both sides of fuse holders, relays, switches etc. A self-powered test light (continuity tester) is like a 12-volt test light, but uses it's own power. Only use the continuity tester on circuits that have no power. It will check power on segments of wiring, switches, and relays. A jumper (10-gauge wire with alligator clips soldered on either end) can be used to bypass switches and relays.
Now you can do the same thing a good mechanic can do. But it also helps if you have a wiring diagram for your bike.