With Cryptoassets, the price of your purchase may go down as well as up - only invest what you can afford. When buying Crypto, you would achieve an amount of coin; the price of each coin can fluctuate (go up or down) and your portfolio would revalue according to the price of the assets held.
Before commencing trades, please complete thorough research and due diligence into any Cryptoasset, service, or platform you intend on using and consider your level of experience, and outcome of the investment. Seek independent financial advice if necessary.