Wo de aihao. 我的爱好

Wo youqi xihuan xue xi hanzi!

我尤其喜欢学习汉字。

Wǒ yóuqí xǐhuān xuéxí hànzì.

Wo de ai hao.

it's not necessary to caps the first word，and the punctuation in chinese is different from english，such as ，。in chinese，but , . in english。

我对学汉字很感兴趣。

Wo de aihao.我 的 爱好

Wo youqi xihuan xue xie hanzi!

我 尤其 喜欢 学 写 汉字！

This indicates that you especially like learning how to write Chinese characters.

If you want to express that you like to learn Chinese characters, you could say:

我尤其喜欢学习汉字。

Wo Youqi Xihuan Xuexi Hanzi.

Wo de aihao.

wǒ de ài hào    我的爱好。

wǒ  yóu qí  xǐ huān xué xiě hàn zì 我尤其喜欢学写汉字。
Evaluation: Your interest is very special.