1-When would you use external flash?

When your in a dark setting

2-Do you need to meter the light if you use flash?

yes, so there’s the right exposure

3-What does flash synchronization mean?

 

4-What does ETTL mean?

Evaluative through the lens

5-What will happen when you shoot faster than the camera sync speed?

6-Why do photographers bounce the flash and use a diffuser?

7– What is a slave?

8-What should you do if your image comes out too dark or too light?