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)