Asked about the Nikon D3100-Len 18-55 mm Kit

I first used the DSLR, pet photography the first shooting, the e has a bit of questions like this, looking forward to the help:
1-in the Menu Setting--Button-there are 3 options:
+ Fn: e ISO set by default.
+ AE/AF L/L button: inside there are other options, e have read and understand each of the 1.
+ AE Lock: only 2 options Yes/No. < want to ask why--E has 2 options is "AE/AF L/L button" and have more choices this 3? How different if in choosing this 3 e select Yes or No?

Because the D3100 e witnessed button AE/AF L/L rather than having separate AE button.

2. in the evening, to the A mode, iso 1600. Same location, same Aperture 1 sight (basically, no tweaking what parameter 1), why does the image when shooting bright images (satisfied) have been (disappointing, hic)?

E just guessing because I press the various buttons half but have yet to understand is different.

3. press the button half-way Also, much of the subject, that sometimes the subject back to blur and background back strokes. That is why?

Can you explain the e with. I still don't know how to press the button half to focus and metering.

(All photos e well to priority mode A, AF-S) AE/AF L/L button: air metering and focus at the same point, is at uncle press autofocus and capture
AE Lock: is your doctor take breakfast on the other and still in focus at the point you want to take, e.g. reverse shots, and I just want my silhouette (shadow) of the sample. So if at option 2 "AE/AF L/L button" I choose the AE Lock Only, while in option 3 "AE Lock" you select No it will be like huh?

Today e just trying again, to Live View mode, when pressing the button halfway up, and keep it at 1 in the morning. Hic, I would help you half-press the service button that bright image with. I like to shoot without Live View is still out for bright images then do it anyway? Hic, the morning the shadows that upset. The same ISO, EV, same aperture A but vary in speed. The doctor helps children experience press the button half that speed the evening always out to be "bright". Troubleshooting your 3 numbers: Since only 11 AF points by 3100 (no more than 2 points in comparison with the canon) that you select AF-S (single) [according to his own ideas so you should select the AF-C (continues)] and also because of the way your sight that the subject may not fall in the AF so it will focus Bg, especially if you want to grab the layout 1/3.
Question No. 2: as per your example, it's very much like Turtle Lake. It has a very dark night, to ISO 3200 is just =)), M for ease of operation, speed, 1/30s is enough because the kit lens has a shake that (car runs shelf, then her dad), the password is to open to the 3.5 or 5.6 depending on the focal length you are how much zoom