How to manage hard drive space without losing data

Hi there,
According to the picture below:

https://drive.google.com/file/d/1CwAHjMyoVfToNNTIyxHymvH4WjKT3YUR/view?usp=share_link
I have a lot of free and unused space in some directories
Now I want to add these empty spaces to the root directory without losing my data or damaging them.
Can you please tell me how I can do this?
BR

System INfo:
Distro Name: CentOS Linux release 7.9.2009 (Core)
Kernel Version: 3.10.0-1160.90.1.el7.x86_64
Platform: x86_64 vmware

Hi,

Just forget about "devtmpf", "tmpfs". Those partitions can't be used as storage device:
https://en.wikipedia.org/wiki/Tmpfs
Once you reboot your server/vps all data in tmpfs will be removed.

The answer to the original question is "very carefully." I have done this on two different servers, using both fdisk (for hard partitions) and lvs resizing techniques (easier/safer). Obviously you are using LVM, and as an aside, I prefer my disk layout to all be one under / (meaning one LVM managed volume -- /dev/mapper/centos7-root -- I don't need the separate /dev/mapper/centos7-home partition. I only feel that is needed if you need it to reside on different storage or foresee expanding /home ad infinitum, or I suppose your backup requirements were specialized.

At any rate, do a FULL backup before proceeding. Be aware if you mess up, you will crash your server.
https://linuxhandbook.com/resize-lvm-partition/