What kind of SharePoint do I have?
If you are still unsure about your SharePoint version, just click the 'Help' button. This will display the help page and page, including the version.
What are templates explain different ways of creating a template?
There are two ways to create a template:
How do I create a form in SharePoint modern?
The option to create a custom form is located in the list settings. Navigate to the list settings and click on Form Settings. Select 'Use a custom form created in PowerApps' or click on the link (Customize in PowerApps), click ok. Keep this in mind just in case you decide to return to the default SharePoint form.