Let's explain this is basic terms:
Money is the store of value, where value if purchasing power.
If $100 buys you a 2L coke today, and only 1L in 10 years' time, then money is a terrible store of value because it loses your purchasing power.
If a house is worth $1 million today and remains worth $1 million in 10 years, but the purchasing power of that $1m has decreased due to inflation, then the house is not a good store of value. This is worse if over time you've spend more money in maintenance.
That's where Bitcoin comes in.