Q: how do I move apps from iPhone5 to iPhone6 ?

They should be in your iTunes library, then sync them from iTunes.

Follow the instructions here or here; using the first set of instructions then requires syncing the second device with the iTunes library containing the content.

If you want to move the application data as well, you need to perform a backup and restore.

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Connect iPhone 5 to iTunes, back-up, follow all the instruction. When its done, safety eject, connect iPhone 6 to iTunes, restore backup. Everything from your iPhone 5 should be on your 6