Yes, Oppo F3 have a Screen Mirroring feature. In fact, all the android are capable of screen mirroring. You and the other device must be connected to the same network. You can download an application from here( Play Store Screen Mirroring ) to assist you with screen mirroring. Alternatively, you need to download the specified application of the gadget, if any you are using.
You can see full specs of your device here: Oppo F3You can follow the video if required:
SAR Value (Head)1.225 Wkg@1g
SAR Value (Body)0.618 Wkg@1g
Considering specs all of them seems nice to me but personally I like my Oppo F3 Plus more as it has better selfie camera, better battery backup , more powerful processor. However, Samsung is good option coz of its better after sales service. One of my friend has Vivo V5 Plus and it also has good dual selfie cameras but call quality and rear camera is not so good. Vivo V5 Plus vs Oppo F3 Plus vs Samsung Galaxy C7 Pro