It is important because there are so many words that are in similar sounds but have different meanings. Sounds alike but its written Chinese characters are completely different. You can practice pronounciation more. Say aloud and try to figure out the difference among the four tones. Good luck!

use chinese tongue twisters to help your tones, also most chinese people won't say this but if you speak fast it doesn't matter 哈哈哈哈 is there anyone that can help me learn chinese charters

more practice with native-speaker makes perfect！

HI, Da er han. In Chinese tones are very important. Here is a marvelous example, a short essay. 石室诗士施氏，嗜狮，誓食十狮。施氏时时适市视狮。十时，适十狮适市。 是时，适施氏适市。氏视是十狮，恃矢势，使是十狮逝世。氏拾是十狮尸，适石室。 石室湿，氏使侍拭石室。石室拭，氏始试食是十狮。 食时，始识是十狮，实十石狮尸。试释是事。 All of the characters used in this story are pronounced SHI.

method is : speak as much as you can.