Recommended droplet size for wordpress and Joomla combo

Hi guys, can you tell me how much System requirments I need to run WordPress, Joomla and do occasional run php and python webpages on…

Let me give you a bit of context…

I want to learn how to fully customize wp and joomla but also learn php and django from the ground up… I am wondering what would be a reasonable size droplet to use for now… I expect at most no more than 5 people connecting at a time on the site… mostly it will be me just checking edits and so forth… tweaking and experimenting…

Reason I ask this is because after 7 days of headaches with zero experience of ssh, linux, commands like systemctl start httpd, ssh keys and so forth I finally thought I was going somewhere had mariandb, phpmyadmin, httpd, sftp, wordpress running but when I tried installing pureftpd I think it also installed postgresql and mariandb crushed and log said something about not being enough resources. looking at monitoring tools on DigitalOcean I saw the charts spike from 60% to 100% right at the same time too…

being the rookie I am I deleted the droplet instead of attempting to remove postgresql incase it was the reason marian would not start. I forgot what I was installing but I remember it mentioning how postgresql eats up more resources than mysql… I think it was virtualmin…

Its been a lot of try and error but I have learnt quite alot thanks to the community guides and tutorials and I am grateful for them and thanks in advance for any recommendations.