I was wondering when should I use point instead of dot and vice-versa. Could anyone help me with that?
In the sentence I had to write that made me think about this, I was going to say that the user entered a value with dots (i.e. a monetary value).
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We would use "dot" in the context of a web address, for example "google dot com". An example I can think of for the usage of "point" would be when you're talking about a decimal value, for example "10.2%" would be spoken as "ten point two percent". With regards to currency, I have never seen someone use "dot" or "point", just something like "five pounds ten pence", "five pounds ten" or "five ten". Hope this helps.
You want something that is unambiguous in the context. Neither point nor dot is going to be as clear here as the two-word term "decimal point".
The user entered a value with a decimal point.
It's hard to see that being read as anything else. That said:
*They entered a value of ten decimal-point oh-three.
Would not be normal, though "ten point oh-three" would.
More generally, point and dot are used for overlapping symbols (overlapping because e.g. · and some other symbols are generally not called point but are called dot) along with period and stop more often in terms of how they are used than the mark itself. Hence it is almost never period in this context, for example.
The use varies with forms of English too. The only real guide is to check on definitions for the context at hand at the time, to pick one that is both known to your target audience (i.e. if aiming at an international audience then period is probably to be favoured today over full stop for that use) and as unambiguous as you can get.