Where do you guys store your passwords?

So in order to create a business I am creating more & more accounts in different services.

Until now I basically had 1 password (with certain variations) for my accounts, excluding actually important accounts like bank etc.

But by sharing my passwords on so many services I feel less and less secure.

I would like to begin using actually complex passwords (basically alphanumerical hashes) but then I will have to store them somewhere.

How do you guys solve that problem? Where do you store your passwords, so that they are safe but also easily accessible from several devices (mobile, personal computer, work computer...)?