Following are the steps for flashing heart in the micro:bit's LED
Click this link https://microbit.org/
Then click on official code editor Microsoft Make Code to do programming
Then click on New Project and give project name as Flashing Heart then this window will display
4. From Basic drag and drop Show Leds block in the forever block and draw heart shape on it.
5. If you have a micro:bit connected into laptop/pc/mobile using USB cable, Click on download button to transfer your code (hex file) and see the result
6. The result is shown below: it will flashing heart on led
