English is an international language. Therefore, it is necessary for us to learn it. It can be rewarding
or just a waste of time. It's up to you. It depends on how you study it. Here are some tips about learning
English.
First, don't be afraid to make mistakes. You will learn from them. Second, you must not be shy. Be
thick-skinned and speak up! Finally, you mush be patient. Remember, "Rome wasn't built in a day."

a little bit disencouraged
universal
Mandarin 普通话，国语
Your stay here is just(or only) a waste of time.
Exercise is a rewarding for our health.
It is up to you. 随你吧
by fits and starts. 断断续续地
My brother studied accounting by fits and starts, so he failed.
tip (about) = advice (on)
tip somebody on something    tip  vt.建议
a good piece of advice  不说: a good advice
stink  vi.臭
be patient with somebody   对...有耐心