how do you make flashing lights

[Chaot1cPro]

hi im making a rescue boat but i have almost no clue how to make lights flash! how do you make flashing lights?

[Arc]

By using blinker or capacitor between your ON/OFF signal source and the light.

[Ra-Ra-Rasputin]

You can also combine blinkers and capacitors in series to make them produce desired patterns.
For instance a blinker that's on 0.9s and off 0.5s followed by a blinker that's on 0.1s and off 0.2s will make a blinker that blinks 3 times within 0.9s, then stays off for 0.5s

[Emily]

One boat I made I built a micro-controller and used RGB lights set to HSV.
Then manipulated them to do some fun stuff.

I have one mode that alternates red / blue in a quad flash synced pattern (Left light flashes four times red, right light four times blue etc).
A separate mode does a fade in / fade out with amber, left and right lights slightly out of sync to produce "randomness" in their appearance.

In the micro-controller, I used blinkers, capacitors and counters along with other logic items.
But I think the fun part is learning by experimentation, so will leave it up to you to enjoy.