There is no source that I know of. I am just going to use my Env book and highlight the imp ones there. If anyone else knows a source, please do share.
This might help.
Could you please snd this pdf again. M unable to open it..
@Dora-the_Explorer right click on it. GO to the rename part and clear the name. Then put any name and add .pdf to the file.
Thanks!! this worked...