There is no best trading indicators. If there was one, all people will have used that already and then it become not so effective anymore.
However there are some indicators are quite simple yet effective and can apply most of the time. Also, combination of indicators is very important.
If you ask which music note is best, there is none, all 7 notes are good, however you combine them nicely then you have a nice song, you combine them wrong..then you know what you will get..
Some good indicators are: (on my strategy)