I am trying to learn assembly language. I tried few tutorials, videos and pdfs but unable to understand much. Since last three days , I am struggling on this. Can anybody please give me a link to good assembly tutorial or ebook? Thanks in advance.
EDIT: I tried the vtc video tutorials on assembly first. After that I searched for assembly tutorials and nasm assembly tutorials in google. Tried first few links but unable to understand much
The way I learned assembly was by reading 'The Art of Computer Programming', you kill two birds with one stone here, you can learn assembler and also learn about algorithms, great books.
Try the Art of Assembly Language: http://www.planetpdf.com/codecuts/pdfs/aoa.pdf
If you are interested in learning the structure of assembly language in general I can recommend MIPS. There is a nice free simulation environment available which I found very comfortable to use. It is called Mars and it helps to understand the impacts of each assembly command.
There is also a course which introduces MIPS from the Darmstadt University of Technology. Sadly the exercises and solutions are only available in German.
Link to Mars: courses.missouristate.edu/KenVollmar/MARS/
I think a good way is disassembling some binaries in ollydbg (for Windows) or gdb (for Linux) and following the assembly code execution. If you're learning Windows Assembly the ollydbg is a very good choice because it maps each API call (with it's parameters), so you can learn the SO details.
At the same time you can read one of these tutorials the guys below said, to learn what each instruction does.
(I'm assuming you're more or less familiar with your CPU architecture)