〜が分かる
understand
Thing + が + 分かる
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分かる means "understand" or "be clear", and like 好き it puts the thing understood before が: 日本語が分かります, "I understand Japanese". The person who understands is the topic: 私は少し日本語が分かります.
It's also the everyday "got it": 分かりました, "understood, will do". To say you don't know or can't tell, 分かりません is the polite and humble answer.
Don't swap it with 知る, "come to know a fact". 知っています is "I know (that fact)"; 分かります is "I understand (it, what you said)". For "I don't know" to a question you have no information about, 分かりません is the safer choice for a beginner.
Examples
私は少し日本語が分かります。
I understand a little Japanese.
この漢字の意味が分かりません。
I don't understand what this kanji means.
はい、分かりました。
Yes, understood.
答えが分かった人は手を上げてください。
If you know the answer, raise your hand.
すみません、道が分からないんですが。
Excuse me, I'm lost.