How can i stick thinks on my walls like posters and papers without making holes or marks ?

Try using blue tek thats what i always do.

double sided tape will work on some walls or try these mounting tabs http://www.officedepot.com/a/products/248352/Scotch-Wall-Mounting-Tabs-1-2/ http://www.officedepot.com/a/products/508226/Scotch-Wall-Mounting-Tabs-1-2/ When I was in college I used this stuff that is sort of like clay and is reusable. It worked pretty well but it sometimes left marks. Perhaps it works better now? http://www.officedepot.com/a/products/508226/Scotch-Wall-Mounting-Tabs-1-2/

Try double sided tape. Also, 3-M makes a lot of products (especially at Christmas) for putting up temporary decorations and they remove beautifully!

I like to use "Scotch Wall Mounting Tabs" which are little sticky foam pieces which, if done carefully, can be later removed from the wall and the paper (usually) without damage. Holds for years too.

use a tape and curl them in a circle, place it behind the poster. the reason why you curl them in a circle because each side can be stick .

you can use rubber glue or tape

use glue or a piece a gum LOL

I've always used tape. Works fine for me

you can always use tape :D