Note: The availability and features of the app might differ from country to country. Kindly check with the app to see what's available in your region.
The minimum purchase amount in Swoo is around €25, give or take. You can also use the US dollar or Brazilian real for the purchase. It's more than enough to start. You can actually spend some money bit by bit, as even a fraction of a coin is already an asset. The growth depends on the market behavior, but some coins like Bitcoin may be a safe haven in the long term.
To learn more, check this article: How much crypto can I buy?