it's as following.
currency aspect: when you buy and sell stuff, send and receive transactions from any level.
investment aspect: when you use it for trading purposes, buying it to hold it for a certain period to sell them later on.
store of value: keeping a good portion of your money in bitcoin for a long period of time. of course this can also be seen as some sort of investment, but a lot people don't treat it as such as their only intention is to keep money out the banking system etc.
these are 3 aspect of bitcoin that i am using.
I mainly use the investment and store of value part. I hold 90% of the bitcoins I bought. I also spend some bitcoins.