My current custom markdown snippets for Visual Studio Code.

markdown.json

{
	"Manual excerpt split": {
		"prefix": "more",
		"body": [
			"<!--more-->"
		],
		"description": "A properly formatted content summary split which I can never remember."
  },
  "New note template": {
    "prefix": "newnote",
    "body": [
      "---",
      "title: ${1:$TM_FILENAME_BASE}",
      "description: $2",
      "tags:",
      "\t- tag$3",
      "created: $CURRENT_YEAR-$CURRENT_MONTH-$CURRENT_DATE",
      "---",
      "",
      "$0"
    ],
    "description": "Writes out the template for new notes."
  },
  "Today": {
    "prefix": "today",
    "body": "$CURRENT_YEAR-$CURRENT_MONTH-$CURRENT_DATE",
    "description": "Writes out the date in YYYY-MM-DD format."
  }
}