I now know different dictionaries from oxford
dictionary to merriam-webster dictionary. But I still find merriam-webster difficult to understand.

I just wonder two things.

1.Do people use merriam-webster dictionary?what kind people use more merriam-webster dictionary than others?

2.when did you become able to understand quite well what's written in merriam-webster dictionary?

Be careful that you don't confuse dictionaries for US English (that is, American English) and British English, especially the Oxford dictionaries. The main dialect for the Oxford dictionaries is British English, though there is also an edition for US English.

I would say everyday native speakers of US English tend to refer to the Merriam-Webster dictionary, rather than the Oxford dictionaries. The Oxford dictionaries would be favored more by people with an academic interest in words, that is, teachers, writers, etc.

Two other popular dictionaries for US English are Random House Webster's (a different publisher than Merriam-Webster) and the Collins English Dictionary, so you might try those and see if they are easier for you to understand than Merriam-Webster.

As far as I know, the Merriam-Webster dictionary is easy to understand for most native speakers of US English, so it is widely used by these speakers. The Oxford dictionaries are somewhat more difficult.

Take a look at this Wikipedia article which describes and compares various well-known English dictionaries and see if it helps you find one that works better for you:

https://en.wikipedia.org/wiki/Comparison_of_Eng...