I assume you're talking about the "habitual aspect". We use the habitual aspect to emphasize that n action is repeated.
For instance, this sentence is in *past simple*: "When I lived in China, I *went* to the market every day".
And this sentence is in *past habitual*: "When I lived in China, I *would go* to the market every day."
The two sentences mean the same thing, but adding "would" emphasizes the repetitive nature of the action.
For *present habitual*, we use "will" instead of "would".
EX: "I wake up very early. I *will usually wake up* around 4:30 AM, but sometimes I sleep in as late as 6:00."
Here, "will wake up" looks just like future tense, but it's actually present habitual.