Why isn't 到 (dào) used in 某天我去北京? Earlier while chatting, I wrote a sentence and a native speaker told me it was correct. The sentence was:


  某天我去北京。= Someday I'll go to Beijing.
  (mǒu tiān wǒ qù Běi jīng)


I noticed that no prepositions are used here. It's probably because I'm still a beginner, but then I wondered: if it's true that 到 can mean "to (a place)", why isn't it used in that sentence? Are there some rules I'm not aware of or something I'm missing? 

Also: when should we use 到? What are the situations/contexts that need it?
First, grammars of Chinese and English are totally different, you don't need the preposition like in English.
Second, in my opinion, 去 indicates that you start the action of &quot;going to a place&quot;,and &quot;到&quot; indicates that you have finished that action, so you &quot;reach a place &quot; or &quot;arrive at a place&quot;.
An example:

本周二我会坐火车去北京，周三到。
I will  go to Beijing by train this Tuesday and I will arrive on Wednesday.