Hey Traders,
Good morning! I just want to ask about how to know the lot size?
For example I open a demo 50,000$ so it means I am in mini lot size?
and then when I am trading using 1 volume it means its running 1$ or 10$ per pip movement?
That’s for you to decide, according to your own position-sizing and degree of risk-aversion.
Sorry, I know that sounds unhelpful, but it’s true.
Here’s how I would work it out. I have $50,000 and I won’t expose more than 1% (=$500) to risk on any individual trade. So, any time I enter a trade, I start by determining the size of the initial stop-loss, and then I calculate the position-size in accordance with the rule that the distance from the entry-price to the initial stop-loss will account for no more than $500 if it all goes wrong and I lose the maximum I can, and I trade however lots/mini-lots/micro-lots is consistent with that rule. Then I know that my risk-exposure is $500 (or something less than that).
I’ll often adjust the stop-loss during the trade, to protect profit or to reduce risk, but never in a way that increases my risk [I]above[/I] 1%.
Be aware that successful trading is all about [B][U]risk-management[/U][/B].
There’s a free position-size calculator that you can use, here: [B]Position Size Calculator: Free Online Forex Position Sizing Calculator[/B]
And there’s a beginners’ book from which you can learn to do this: [I][U]Profitability & Systematic Trading[/U][/I], by Michael Harris (Wiley, 2007). If you look around online, you may find a downloadable PDF copy of it.
Edited to add: the Babypips School input on this subject is here: [B]What is a Lot in Forex?[/B]
It depends on the currencies involved. If it’s EUR/USD, for example, then 1 full lot represents $10 per pip, and a mini-lot represents $1 per pip. This is also exlained in the “School” pages here. 
Okay lexys I got it now, Thank you so much it helps a lot. :-*