who can tell me about the netherlanders' and germans'custom? thankyou!

Ihave a friend who comes from holland, so i need know about sth. from netherland . could you give me some knowledge about  it ? thank you so much !

i 've learn a little from my english-reading-execise..

about holland:

1.when u're meeting with them,always shake hands &

kiss cheek ….

2.don't talk about  something like politic of US,money&prize of something with them

3.they hate"13","friday"  it's unfortunate to them

that's all 

thanks 

thanks coastee , you helped me a lot .