The phrase "a beginner of" is correct and usable in written English.
You could use it to describe someone who is just starting to learn something, as in the example sentence, "He is a beginner of piano."
There is the classic use by a beginner of words which have been lifted from translation with no real understanding of their meaning, for example "have the ado".
When she was in her 40's, Ms. Gordon decided her dream had been denied too long, only to discover that most ballet schools were hesitant to take on a beginner of her age.
Tango is a new body for her, a new way of being in the world, as any dance technique is, and Diane is deep in the wonder of being a beginner, of just seeing how things connect.
Relate: If you can type fast on laptops then you are already a beginner of a Blackberry typer.
Don't try shading when you're a beginner on a real piece of paper, you could ruin the entire thing.
Students shifted from a beginner to a novice level of understanding and from a novice to an advanced level of understanding.
If you are a beginner, instead of making a round shape, try a square.
In contrast, seven competencies were considered only to require the attainment of a beginner's level of competencies by the group working in academia.
In pottery, there is a delicate line between the unevenness of a beginner and the unevenness of a master.
The notion of a beginner- to- expert continuum is similar to those described in other contexts (Chi et al. 1981; Bransford et al. 2000; Petcovic and Libarkin 2007).
@garyshainberg took a group of us though a beginners bag of tips and tricks on digital photography.
