How to take a video on iPhone X?

So I just realized that the video isn't next to the camera anymore and there isn't a section for it? Does anyone know how to record on the iPhone X?

What happens if I turn off 'find my phone'?

My phone just made me have to re activate it, randomly. I have an iPhone 6. I barely remembered my password so I dunno even how I got back into my phone. Why did I have to re active my phone and how can I stop it from happening again? Is it because of the feature 'find my phone' and what happens if I turn that off?
I'm so bad with apple phones and I don't know why they make things so complicated.

IPhone camera setting for concert?

I'm going to a concert soon. The concert uses lots of lights/strobe lights, lasers, pyrotechnics so on. They are known for the crazy light show they use on stage. Anyway, I have the iPhone 8+ and was wondering what camera setting would be best for this type of concert. "1080p HD at 30 fps" or "1080p HD at 60 fps"

What's the best way to get a new smartphone on tight budget?

Due to disability I can't work at the moment, thus my budget is beyond tight.
FYI I don't use my phone for texts/calls so a contract is a little pointless.

I need a new smartphone - I use my smartphone as an accessibility tool, thus arguably more of a vital item than it may be for a non-disabled person - but without the cash I'm not sure how best to try to get one. I'm not after the latest iPhone, I currently have a Motorola Moto G 1st gen and I'd like something similar.

What iPhone shall I get?

Ok so before you say the 8 or X or whatever I'm not that rich lol. I'm thinking of getting it off ebay since I have done before and the phones have always came fine. To give you an idea of the price range a 6 is about 180 and 6s about 230. (btw I'm in uk so if you in other country either don't answer or use converter.

What iPhone case should I buy? - 2

I have a thick aux cord and I can't find a case that I don't have to take off to plug in the aux. Know of a clear case I don't have to remove?