How to write in Chinese

[Markos <markos@c2o.pro.br>]

Please,

I am studying Chinese and I need to install fonts to type ideograms in 
Debian 9.

I use Brazilian Portuguese, but I don't want to reconfigure my computer 
to type only in Chinese.

Using LibreOffice or with a specific program to generate the ideograms 
only when needed.

Any tip?

Thank you,

Markos