However, isn't the value of bitcoin almost always going to go up so its best to hold it?
In theory it should being a deflationary currency, but it all depends on supply and demand.
I know last year it was $600 and the highest was when it was more than $1000 per bitcoin. But since it is all the way down to $200-$300, isn't having bitcoin always good?
Again, in theory the halving should push the value up but that also depends on what the demand for coins is like.
Could bitcoin go all the way to 0 soon?
It could go to zero or less than $100 but probably wont anytime soon and hopefully never.
In general, isn't holding BTC always a good thing since the price of it is pretty low now? Obviously if you bought btc at $600 or $1000 and thought it would went up and held on to your btc, that would been a disaster. But since its in the $200-$300 range, isn't having BTC always good?
The price is very low and bitcoin hasn't reached even a small percentage of it's potential so the potential for it to rise dramatically or go back to around $1000 is very good in my opinion though we may need patience.