Can someone help me explain...
On MT4, when I open an order and see 0,01, 1... Is 0,01 a micro lot? And 1 a mini lot? or is 1 a standard lot?
The MT4 platform minimum lot-size that can be traded is 0.01 no matter what type of account is traded.
--- Standard Account uses a 100,000 unit lot-size, and the 0.01 lot is called a micro-lot (1,000 units in trade, could be dollars, euros, whatever the Account-currency is).
--- Mini Account uses a 10,000 unit lot-size, and the 0.01 lot is called a nano-lot (100 in trade).
--- Micro Account uses a 1,000 unit lot-size, and the 0.01 lot is called a pico-lot (10 in trade).
Cent accounts trade nano-lots or pico-lots and there is some confusion there as different brokers name these accounts differently.
Risk comes from not knowing what you are doing.