Should I buy books / apps?

A big YES

The MORE books you have may equals to the higher chance that you master the language

BUT

The MORE time you spent on studying the language “truely” equals to a good performance

A good book  = shortcut to the core part of the language

BOOKS are not expensive, WHY not?

They are good reference, always available 24hours 7 days

They are structural – in great details

you can learn on your own pace 😀

(yes, you will probably get some useless books / apps, take the risk, you can go to youtube to take a look of the comments on related books)

I strongly recommendation “Lonely planet phrase book” (best suit for who wants survival Cantonese, best suit for upper beginner & intermediate, as for beginner, it is still something relevant to read, so don’t miss it)

(sold 10 million of copies, I guess people really like it)

Do not buy Sidney Lau’s book, it is not for self learning, but you can challenge yourself.

Betty Hung’s book are good.