Okay thanks a lot for all your input. I already have bought a ledger nano and will start using it.

Writing the seed phrase on multiple different pieces of paper seems a good idea. If one gets stolen the thief still cannot access my coins. However, the downside is that if I lose 1 of the 4 parts of my phrase seed, I no longer have the complete phrase and it basically means I have lost the whole phrase.
Maybe, to tackle that problem the best solution would be write the phrase on 2 pieces of paper....divide them up into 4 parts each so I have 8 pieces of paper...1A,1B,1C,1D,2A,2B,2C and 2D and then store them all in separate locations. Would that be the best solution?