The minimum trade size will depend on the product you’re trying to trade.
For currency pairs, metals and other commodities, the minimum is 0.01Lots
For Crude oil, the minimum is 0.1Lots
For CFD Indices, the minimum is 1Lots
For Crypto CFDs, the minimum size for BTC pairs is 0.1Lots, the rest of Crypto CFDs is 1Lots.
Remember: different products have different notional values. We suggest you place trades using a demo account, in the first instance, to familiarise yourself with these different trade sizes.