.... Just a quick addition to my reply.
If you want to take indoor 'snaps' in a hurry and with flash,you can do so on program (P) mode but it helps to have some other light source shine on the subject just for focussing. If it is too dark and you are too far away from your subject,the cameras sensors cannot 'see' and therefore cannot focus.
Even a wee LED light or torch will do,but remember to move it off the subject after focussing and before shooting as you might end up with a yellow patch of light in the middle of your photo.I've found this technique very useful in cave photography.
Cheers
Steve