First create a file named hosts
touch hosts
Open and edit this file with vscode or gedit, and write the following content:
127.0.0.1 localhost
#xxxxx为你的计算机名
127.0.1.1 xxxxxxx
# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
# 以下是你需要改的内容，ip+网址，以下为示例
39.105.88.167 www.github.com
112.32.5.63 www.baidu.com
Finally, copy the modified hosts file to the /etc directory.
sudo cp hosts /etc/
It's that simple