1) Battery Life
Its obvious that your camera should have a good battery life. otherwise you will unable to capture more and more images
2) Optical Zoom
Optical zoom shows the power of your camera lens. more optical zoom means a more powerful camera lens. An average camera has 3x optical zoom
3) Mega Pixel
more mega pixels means more larger pictures. but don’t make mega pixels your first priority. because you are not going to print a very very mega large picture. so mega pixels matter , but they are not much important as other features. now a days cameras with 8 to 12 mega pixels are available. even 6 mega pixel camera is acceptable for home use photography and printings.
obviously price is also a feature of a camera. a best value product contains more features in less price. for a home user , a camera between 100$ to 300$ dollars is acceptable, depending upon the budget you can compromise on features.
5) Video recording
as the social media is growing , you need videos to share with friends , good still cameras provide the feature of video recording. see how many frames per second they are providing and what is the video size and format.
6) Camera Speed
Cameras has processors inside , which run some automatic functions. 1st thing is its capture speed , how many time it captures a single images , if a camera is slow in capturing images , you can not take the other photo very fast. result? you miss the golden moments which you want to capture. similarly auto focus is an automatic function , as you zoom , the lens changes its position , it adjusts it focus , also it finds the human faces and adjust its lens focus on them. slow auto focus means that you will not get clear pictures.
so these are the 6 main features, more features includes , shock adjustment , red eye effect removal , camera performance in poor light etc..you should also have a look on them before buying a camera.