Create and mount swap file:
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1. Create the file by using dd. the count number will be how many megabytes you want.
sudo dd if=/dev/zero of=/swapfile bs=1M count=4096 status=progress

2. Convert blank file to swap file by:
sudo mkswap /swapfile

3. Set swapfile for root only:
sudo chmod 600 /swapfile

4. Actavate swap file (for current session):
sudo swapon /swapfile

5. Edit the /etc/fstab file as root and add this line so swapfile will mount at boot:

/swapfile    none    swap    sw    0    0

save the file.

Done!

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Source: https://www.howtogeek.com/455981/how-to-create-a-swap-file-on-linux/
Date: Jan 29th 2023