MacBook battery shows 0% when turn on

That computer is a battery-CAPABLE device. It is not optimized as a battery-operated device. (It is NOT an iPhone.)

Your computer performs best when connected to AC power, such as the power adapter. It can use the full output of the Power Adapter AND when doing especially challenging work will also freely "borrow" power from the battery. In some cases, even with the power adapter connected, the charged state may decline during very stressful work.

When used only on battery, your computer has no extra cushion of power, and may perform more slowly. However, for ordinary non-stressful tasks this may not be objectionable (possibly not even noticeable.)

In general, you should ALWAYS connect a power source when it is possible to do so, and only run on batteries (which could be somewhat slower) when no power sources are at hand. Modern Macs maintains optimum battery charge levels under program control, and will NEVER over-charge. Activate Battery Health Management and do not spend another moment of your time thinking about charging.

When you set it down in one place or for the night, plug it in. Then you won't CARE whether it would drain the battery when nominally asleep.

The Approved method for improving the sensitivity of the battery fulness gauge is to charge your Mac to 100 percent, then charge for several MORE hours.

What does System Settings > Battery > Battery Health show for "Maximum Capacity"?

Then use Launchpad to find "System Information."

and open it. From the left-hand contents pane select "Power."

What does your battery information show for "Cycle Count" and "Condition" under "Health Information'"