Drupal 8.x

I have to rebrand and custom design the theme of a live and running Drupal 8 website. I wondered if there is any best practices post or blog that anybody could share or anybody would want to share their practices for such similar case.

I wanted to create a new sub theme on a suitable base theme.

In my limited experience I imagine if I want to design and test it in my localhost then I have to create a copy of the website in my localhost and then i would have to reinstall the website again on the live server.

I have my main directory at "C:\xampp\htdocs\drupal", and there are two sites laying there: one for production and one for test:

• prod: "C:\xampp\htdocs\drupal\prod"
• test: "C:\xampp\htdocs\drupal\test"

to make this short, I add these to my httpd.conf like:

Can someone provide me example/help with sending an html formatted email programatically.

I'm trying to upload an image inline, into a custom block. I can't because it's a different filetype (jpg 2000) 

But I cannot for the life of me figure out where I change that setting to allow other file types. I thought I'd seen it somewhere before.

This is Drupal 8

I've got this userflow, but commerce webform order doesn't do what I want - I want to submit the webform after checkout. 

What I've got figured out and is working:

1) User A fills in webform A and submits it

2) Car dealer B receives an email with a link on it to a different webform  B

3) Car dealer B fills in said webform B to reply to User A

4) Car dealer B then has to pay X and go through a standard checkout to submit webform B

I recently had to set up a multi-site instance of Drupal from scratch; and now, I have to do so again. I recall it being fairly painful, due to somewhat scattered and/or out-of-date documentation. Therefore I have decided to document my procedures in excruciating detail, for my own future use and (hopefully) to help out others.