How to make SharePoint templates for your company

ArthurWW 

These are "Site Designs".
See more information here: "https://learn.microsoft.com/en-us/sharepoint/dev/declarative-customization/get-started-create-site-design"

Basically you need to create the template as a JSON File

 $site_script = '
 {
     "$schema": "https://developer.microsoft.com/json-schemas/sp/site-design-script-actions.schema.json",
         "actions": [
             {
                 "verb": "createSPList",
                 "listName": "Customer Tracking",
                 "templateType": 100,
                 "subactions": [
                     {
                         "verb": "setDescription",
                         "description": "List of Customers and Orders"
                     },
                     {
                         "verb": "addSPField",
                         "fieldType": "Text",
                         "displayName": "Customer Name",
                         "isRequired": false,
                         "addToDefaultView": true
                     },
                     {
                         "verb": "addSPField",
                         "fieldType": "Number",
                         "displayName": "Requisition Total",
                         "addToDefaultView": true,
                         "isRequired": true
                     },
                     {
                         "verb": "addSPField",
                         "fieldType": "User",
                         "displayName": "Contact",
                         "addToDefaultView": true,
                         "isRequired": true
                     },
                     {
                         "verb": "addSPField",
                         "fieldType": "Note",
                         "displayName": "Meeting Notes",
                         "isRequired": false
                     }
                 ]
             }
         ]
 }
 '

Then you connect via Powershell to the SharePoint admin side and apply the template

connect-sposervice https://<yourtenand>-admin.sharepoint.com

$d=Add-SPOSiteScript -Title "Create customer tracking list" -Content $site_script -Description "Creates list for tracking customer contact information"

Add-SPOSiteDesign -Title "Contoso customer tracking" -WebTemplate "64" -SiteScripts $d.Id -Description "Tracks key customer data in a list"

Then the design is available



There is also an older solution called  "Site Design Studio" that can kind of extract a site script from an existing site.. But the last commit is more than 2 years old and i haven't used it in a while.
https://github.com/pnp/sp-site-designs-studio