Will my razer Blade 15 base 2020 be overcharged if I leave it for a charge a long time?

No. The Razer Blade series uses a lithium-ion (Li-On) polymer battery. The Blade laptops have an internal circuit to stop charging at full charge to avoid overcharging and will only start recharging when the battery hits 95%.

Note: It is highly recommended to cycle the battery every couple of weeks.

The above sources from official website.

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Can I replace my apple Macbook air 2020 m1 entry battery at home?

Of course you can, here is a copy from official manual, it tells you the best practice to handle the batteries. To avoid noxious fumes or a battery thermal event, don’t puncture, strike, or crush a lithium-ion battery or a device that contains one.
• Keep your workspace clear of foreign objects and sharp materials.
• Be careful when using sharp tools near the battery.
• Don’t leave loose screws, extra screws, or small parts inside the device.
• Don’t use tools that conduct electricity.
• Don’t throw or drop the battery.
• Don’t expose the battery to excessive heat or sunlight, or temperatures outside the battery’s operating range.
• Handle and dispose of waste batteries in accordance with local laws and regulations.