I was wondering what's minimum / ideal amount of BTC or ETH I should have in order to start trading activity
If you have any idea or just want to share your first experience in crypto trading, feel free to write them bolow
No one has forced you to invest much in the transaction. In contrast, you should invest a small amount of money in the first attempt. But you need to pay attention to the amount of fees that you pay for each transaction, currently it is quite high only suitable for relatively large transactions.