Hi Hasan
You mentioned about Exchange rates in one of the video

i noticed that there is one Conversion rate type -- Account Type

Can you please advice what exactly its is and when its used for

Conversion rate type is the rate type that would be used for conversion.
Conversion is refers to when you enter a foreign currency journal/invoice etc and
the amounts are converted into functional currency.
A rate type is simply a grouping of different exchange rates.
You can enter one exchange rate in one type and another one for the same date in another rate type.
Account type refers to the type of account: Asset, Liability, Equity, Revenue, Expense.
If you could illustrate more on where did you "notice" "Conversion rate type -- Account Type" then
I might be able to shed more light on the topic.

here's the screenshot

I repeat: Rate types are simply groups of exchange rates. Each manager or group of users can create their own rate types in the system if they want to use different exchange rates.
Looks like the rate type you are referring is a non-seeded one.