To remove black frame (empty space) around the screen just disable ‘overscan’ option in Pi Configuration.
Raspberry Pi 4 
Raspberry Pi 3
Category: Tuning
exFAT, NTFS, Mount Windows Shares
Pi 64-bit:
- The system already has ntfs-3g installed, but I’ve failed to get mounted and working NTFS formatted USB drive
- For exFat is still the same
sudo apt install exfat-fuse
Pi 32-bit: Let’s add exFat and NTFS support to our Raspberry Pi:
sudo apt update sudo apt upgrade sudo apt install exfat-fuse sudo apt install ntfs-3g
To mount Windows shared directory:
sudo mount -t cifs //ip_address/share_name /home/pi/local_dir -o username=win_user,password=win_pswd,uid=local_user,gid=local_group
Without uid & gid, the directory has been mounted as read-only
Resourse: Raspberry Pi exFAT: Adding Support for exFAT File System – Pi My Life Up
Set up/Change swap space?
sudo nano /etc/dphys-swapfile
Change (absolute value):
CONF_SWAPSIZE=4096 CONF_MAXSWAP=4096
Update swap file
[ dphys-swapfile setup ] - optional sudo service dphys-swapfile restart
Source: operating systems – How to set up swap space? – Raspberry Pi Stack Exchange
Raspberry Pi 4 Overclocking
Did not run any benchmarks, but it seems to run faster. Better use a special case with active (preferred) or passive cooling (in my case, the system was unstable at 2GHz)
So, run editor:
sudo nano /boot/config.txt
Pi 32-bit: find [pi4] and add after for 2GHz (64-bit Buster: there is a line #arm_freq=800):
over_voltage=4 arm_freq=2000 gpu_freq=750