Check whether your MacBook has an Intel processor or Apple silicon
Back up your MacBook with Time Machine or another backup method
Make sure you have enough free storage space
Download a Windows ISO from Microsoft
For Intel MacBook:
Open Boot Camp Assistant
Follow the on-screen steps to create a Windows partition
Select the Windows ISO
Set the partition size
Install Windows
Restart and complete the Windows setup
Install Boot Camp drivers in Windows
For Apple silicon MacBook:
Install Windows using a virtual machine app such as Parallels Desktop, VMware Fusion, or UTM
Create a new virtual machine
Select the Windows ISO or Windows ARM image
Allocate CPU, memory, and storage
Start the virtual machine
Complete the Windows setup
Install guest tools or integration tools if prompted
Update Windows after installation
Install any required drivers or software updates
Set macOS or Windows as the default startup system if using Boot Camp
Keep regular backups of both systems