How Can I Become A Good Writer In The Field Of Formal Letter Writing?

To be a good formal letter writer, you need a number of skills and knowledge bases.

I will outline these below:

Good letter writers are aware of their reader, perhaps this is the key to good letter writing, thinking about how the reader will respond the letter.  The writer has no control over the reader, but it doesn't mean that they shouldn't think about them when writing.

Good letter writers have excellent knowledge of manners, professionalism and conduct, so that letters are always received in the right way.  Manners are also very important, so is being able to come across in a professional way.

Obviously, spelling and grammar must be perfect.  Not good, perfect, one spelling error ruins the entire letter, it's sloppy and looks like you didn't care.

You also need to be well versed in your subject matter, or your letter will not have the desired effect.