[LG V20 Questions & Answers] CHH2:
Seems there's very few resources out there that are concise and cover what one needs to know to get to manual shooting with something like this. I only had a few minutes to play with the V20 (and most of that was with the camera) so I'll try to give it a whack. First thing I'll tell you is to take a deep breath and a sigh of relief. The V20 will make learning manual a breeze!

The V20 seems to adjust the view on the screen to what settings you use. Don't use a long enough shutter speed or high enough ISO? The screen gets dark. Use too much of either or both? Screen starts to blow out. Don't have the right white balance, you'll probably see that too. (White balance can be a little tricky though. It actually wants to change the photo from what you are actually seeing to make sure whites are always white. This ends up being a little bit personal preference and you can end up with some cool effects when you learn it deeper.) What's really awesome is that manual focusing has the aid of focus peaking.

Setting your exposure usually entails the exposure triangle of aperture, shutter speed and ISO. (ISO is its own mess to explain but overly simplified, it's the "strength" but it comes with the downside of noise as it gets stronger.) Your desired exposure would be the geometric area of the triangle for the sake of analogy. You can push and pull on any of the corners of the triangle you want but if you want to keep the same area, you'll have to also push or pull on one of the other corners. On the phone cameras, the aperture is usually locked. In the case of the V20, that's 1.8 for the main camera. So you get shutter speed and ISO to play with. If you use a low ISO number, you will need to pick a slower shutter speed. If you use a higher ISO, you will pick a faster shutter speed. The view on screen will let you know if you're going in the right direction or not as I mentioned earlier.

Faster the shutter speed, the better to freeze motion. The slower shutter speed with blur motion. Lower the ISO number, the cleaner you photo will be from noise. (Shows up as a bunch of speckling, sometimes different colored speckles.) The higher the ISO number, the more noise you will see.

White balance can be set to make sure the colors hit the ideal, so whites are white without a color cast to them. This gets to be a little bit of a mental exercise. A lot of people are completely on board with the idea that if they are shooting indoors in incandescent light, they should set the WB so that the incandescent light gets filtered out and white is white again. The problem is that this isn't what you're actually seeing, you're idealizing the scene. In reality, that incandescent light is part of the "ambiance" of the scene. So the nice thing about manual WB is that you can decide which is more important to the scene, white whites or the feel the light gives to the shot.

Manual focusing can be extremely difficult without a proper aid. The V20 features focus peaking. As areas come into focus, they will light up with a bunch of glowing lines. This helps heaps.

Something else worth noting that I saw when I was playing with the V20 was flash modes. The standard no flash, forced flash and auto flash are there but there's one more denoted by a flash symbol with a "R". I'm assuming this is read curtain sync flash. Normal flash goes off at the beginning of an exposure while rear curtain goes off at the end of the exposure instead. The usual way to demo this is a car driving away at night. (Assuming we're using a flash stronger than the V20 but you'll get the idea.) With regular flash, you will have a photo of a car close to you that has trails of tail lights disappearing off into the distance. Rear curtain fixes this by having lead off to the distance where there is the car. If you use forced flash, I would tend to opt for rear curtain. Auto will use front curtain if you have that in play.

Video is whole different beast that I'm still teaching myself. I know you want to use a shutter speed that is double your frame rate. So a frame rate of 24fps would result in 1/50s shutter speed, 30fps is 1/60s, etc. The slow mo settings like 120fps require a lot of light! But there's a lot more to video that I still have to learn but as far as phones go, the V20 looks like it is way ahead of the game compared to even my DSLR.