vim command to delete lines

My fingertips know the command to delete all the lines starting from current line till EOF (that's d + shift g) but I rarely remember the command to delete all the lines up to head of the file.

Luckily, vim offers a simple approach to delete desired lines, all we need to be aware is the following

• . (dot) - represents current line
• $ - represents EOF
• syntax: start_line_num,end_line_num vim_cmd

Some example usages (Note: these commands are run in the editor, hence the beginning colon)

• Delete all the lines starting from current line : .,$ del
  
• Delete lines starting from 1 to so far : 1,. del
• Delete all lines between 10 and 25 (inclusive) : 10,25 del
• Delete all lines between 10 and 25 (inclusive) : 10,+14 del
• Delete next 15 lines including the current : .,+14 del
• Delete last 15 lines including the current : .,-14 del