Need help with FLASH

[HelenOster]

hello,
I do not own a flash and I was thinking of purchasing one soon and try to experiment and get into using flash and what not. So far everything I've been shooting was with natural light. I want to shoot at a club/lounge so I was wondering if anyone could recommend a flash that they maybe had experience with?
I have been looking at few at adorama but its hard for me to decide which one to get because I don't have much experience with any.

Also, would it b possible to use my build in flash and put a diffuser on it? is there a big difference between the two?

Thanks in advance. :hug::

I wonder if you might find anything useful here:

16 flash terms you should know from Adorama Learning Center


On-Camera Flash Basics


Wireless flash backlighting basics from Adorama Learning Center


Portable Flash Light Modifiers from Adorama Learning Center