For me Ledger Nano S is the best and most convenient cold (hardware) wallet. They've recently updated their software and now you can see your portfolio balances without connecting your wallet to the pc

This time they have managed to scare shit out of people and because the last year's moon attracted an army of new crypto followers, this year's gains from panic is huge! So, let's keep on hodling

The question is very tricky: on the one hand, unless and until people can pay for goods and services using Bitcoin and accept BTC as a settlement for goods and services without any fiat, the government is going to be able to control people and regulate operations of exchange Bitcoin into fiat and make people pay taxes on such transactions. On the other hand, if the government permits us to use BTC without changing it into fiat, it is not going to be able to control the operations in BTC
There are lots of things the government has to decide.

I got confused: some people say it can't be centralized, some say it can. Can anybody explain whether or not it is possible technically? Does centralization/decentralization depend on where the mining equipment is concentrated?

I believe 2 to 5 years from now we might have a situation when people are well aware of and ready to both accept and pay in Bitcoin; however, I don't think having only one currency for settlements will be very beneficial. I believe we need a number of payment options. That will give us more flexibility

Good point.

In terms of transaction safety, I believe it is, but in terms of keeping it (i.e. being hacker-proof) or investing in it for hodling it is highly risky. Nevertheless, I think it's worth it, anyway