For example, what kind of working environment, frameworks, etc. Is there any general instruction or video I can watch?
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You can use a webserver such as Apache to serve HTML files. Apache can be installed by using the commands below depending on your OS.
Ubuntu:
CentOS:
After you have installed apache like MDS says with that command, you can upload your HTML site inside
If you want to configurate apache to handle domains, you need to create a VHOST. You can learn more about this in another tutorial
I installed a wordpress website before but everything is configured by Digital Ocean; what am I supposed to do for normal html site?