Question: When I make a table, there is a column we left for the things we forget to write down on it. What would we call this item? Remarks or Note?

Answer: 
I would use *Remarks* if the material was of interest to the document reader. I would use *Notes* if the material was a reminder to the author that re-work might be required.
I would use 

**Remarks** - for short words

**Note** - for long words, bullet points or even a long paragraph