Nothing much can we learned from the forum.
Forum is full of the blind trying to lead the blind and you ended up with more confusions when tried to learn from forum.

I see that a lot of people, new in trading, they got very thrilled in trying to trade and thinking that they can made profits
with just a few lines. When such lines failed, they try to learn indicators and played with the indicator thinking that those
indicators are magician that can delivered them profits. I belong within this category before, every NEW traders would have
to go through this phase.  Eventually, you will only learned that indicators are useless after you suffered big losses.
Then, you will questioned yourself whether you are gambling or you are trading.

After previous emotional breakdown from huge losses, you will take a long time break. Then, you decreased lot size hoping to
earn a few pips, an attitude change occurred here. You dont chase for profits anymore, but reasoning. You went to forexfactory.com
and saw a few trade record that show consistence profit and questioned yourself, why people can made profit while you cant.
After some more time of consistence will to trade, you discovered that trends work. Then, your old behavior come back, you
keep increase lot size to made big profit and eventually BOOM. You blow off your accounts.  You then learned of good money
management and caution in increasing lot size after that. Yet, by following trends, you can only be a seasonal trader, whenever
there are changes in interest rate, trends changed and sometimes it dont, then such funny policies confused you more as time passed.
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Eventually, you will spend more time for reading, any knowledge that can boost your decision making skills and cleared your doubt.
It is the profit desire that keep pushing you to read more so as to reduce potential loss in future. This stage can take for years.
It is during this time that you carved your fundamental that trading is not an emotional game anymore.
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I see that retail traders often repeat one mistake. That retail trader start with small lot size and whenever those retail trader win a few trades,
they will increase the lot size so as to win more profits and eventually they lose back all the money plus losses to the market. The profit/loss concept.

How is the profit/loss work?
In reality, you earn profit by satisfying customer needs. That is, you anticipated what the customer wants, then you sell those products.
You earned profits when your anticipation is correct, and you earned losses when you anticipated wrongly of customer wants. Example:
Suppose that along a street where there is no stall and yet a lot of people cross this street and suppose that people walking along this
street want to eat nasi lemak. Then, the very 1st people learned of this customer needs and sell nasi lemak in this street, this very first
guy will earned the highest profit. Therefore, when no people enter in his business, he should increase his nasi lemak. When other people
see him earning profits and also selling nasi lemak, now this profit is shared by two guys. As more people sell nasi lemak, the very first
guy should reduced his stake on selling nasi lemak, because now the profit will keep decrease.

TLDR: Once you discover a trend, you should increase lot size and after certain time, you should keep decrease your lot size because now
the trend is discovered by the public and profit is diminishing. What the retail trader will do is that they keep increase lot size when those
strong hand reduced lot size.

Happy trading.