Calorie count and work out questions

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Ok, I know this is probably simple enough but I'm not sure of the answer. Say my calorie count is 1400 a day and I eat 1200 calories. I ride my bike for a while and it burns 500 calories. Now my total calories that I'm able to consume is 1900. Should I stick with the original 1400 calories or eat more because I'm burning more? What is the safest and healthiest thing? (these are estimates - not actual numbers). My current day looks like this.

Goal. 1380 Food 1488. Exercise 1806. Net -318. Remaining 1698.


Should I eat more? Or what. And what is the net -318?


Thanks for your help!!