As an alternative to the most commonly used PDF document format at present, the advantages of DjVu format (from France) are quite obvious: on the premise of storing the same content with same quality, it is much smaller, more readable and opens much faster than PDF. In this case, for any PDF documents with large file size, we might as well convert them into DjVu format, so as to get more convenience.
First of all, please note that: UHARC/GUI (finished in 2007) is far from being WinUHA (finished in 2005) with a similar alias 'UHARC GUI' (most software download sites mixed them up). It has a compression ratio even higher than 7-Zip - basically we are sure it's the only multimedia archiver in the world now that supports the maximum compression rate (UHARC/GUI > 7-Zip > WinUHA >> WinZIP/WinRAR).
First of all, Responsive Web Design by Ethan Marcotte is a very good quick-start handbook (less than 300 pages) that suitable for readers who have certain CSS basics. When finish it, you will suddenly become extensive and know the responsive web design at your finger's tips from feeling very mysterious about it.