...and I switched to the spot market and tried to hold my favorite altcoin and as a result my money was still safe there,
so I suggest beginners trade on the spot market.
Trading on the spot market, you still have a slim chance that the value of the coin will return to the purchase price again and you will be able to close your deal at breakeven. Sometimes it takes years. With futures, your unsuccessful trades are liquidated very quickly and you will not have a second chance that the price will recover and you will get your money back.