yes lot size depend on our account balance and i say that we work in market with low lots and we do not use big lots size order in market and beginners must use low lots in market and beginner follow the good trading strategies and beginners work with careful trading methods and beginners always understand the market risk management and work in market with experience then beginners make good earning in forex market
for beginners it is recommanded for them to use mini lot size as they are not trained well. they can trades with small transactions but it is goods for them as if in case they lost a trade.