For a example, it said,
"Open the folder, and find the file you need to change. Open it in your favorite plain-text editor. Note: Do not use a rich-text editor such as Word or OpenOffice to edit the files."
What folder? I know that it means folder which has WordPress core files. But where should I get it? (From https://wordpress.org/download/ ???)
Then, when went to create a new ticket should I select "enhancement" as type?
Then how to upload patch?