才疏学浅

cái shū xué qiǎn

my talent and learning are limited (modest)

Character by character

才cái
talent

疏shū
sparse

学xué
learning

浅qiǎn
shallow

我才疏学浅，只能谈一点个人看法。

I'm no expert, so I can only offer a few thoughts of my own.

Tone: neutral.

Only about yourself; never describe someone else this way.

Learn it in context

This idiom and thousands more are in Learn Chinese with Bao, with audio, pinyin and drills that make them stick.