Japan is very encouraging society. One set phrase verb you can use in multiple situations is ganbaru (頑張る). This word can mean any of the following phrases.

   ● (I will) Try
   ● (I will) do best
   ● (I will) have good luck
   ● (I will) work hard
   ● (I will) Push through

   Like other verbs in Japanese it can be conjugated into different forms and used in a wide variety of situations.

   I have a test on Friday
   Do you best = ganbatte (頑張って)

   Can you fix my toy?
   I will try my best = ganbarimasu (頑張ります)

   I'm going to get ready for work now
   Do good at your job ok = shigoto ganbatte ne (仕事頑張ってね)