How can I extend the size of the linux primary partition?

How can I extend the size of the linux primary partition? -- Linux general technology-Linux technology and application information. For details, refer to the following section. Ask a stupid question:
I have installed a vmwarevm. The system is redhat9.0. but recently I found that the partition was unreasonable:
Run the df-lh command to check whether the active partition has occupied 100%. The following message is displayed:

Mount point for available and available File System usage
/Dev/sda2 2.9G 2.9G 0 100%/

How can I extend this partition?
Thank you ~~~