Many of us use the classic Contacts app from Android. If you are a person with a lot of contacts, this could be tricky. At some point all your agenda could be messed up, with double entries or persons that you don't need there anymore. We will tell you how to make a clean contact list that you could be proud of.
If you have created your contacts list from different social networks there could persons that are two or three times or you could have contacts with no name like in the picture below. If so tap on them and see from what social network did you get that information.
You should check from what social network do you want your contacts to sync. If you use your contacts list just to call people or email them, then you can uncheck all the other social networks.
Also, if you see a double entry you can tap on the settings button in the right top corner and hit the action overflow, where you will find the action to Join. Then, look after all the contacts for that person and stick'em all together. If that contact misses it's profile picture, you could choose a picture for it.
Basically, if you have some contacts that you dial them more often you can make them your favorite. Tap on the star on every contact and there you will have all your favorite contacts in the Favorite section.
To make a cleaner contacts list merge all the contacts, get rid of those that you don't use and choose your favorite ones !