I don't think these can be learned through books. What you need is practice. Years of practice in performing arts has made me good in public speaking, and my s

I don't think these can be learned through books. What you need is practice. Years of practice in performing arts has made me good in public speaking, and my stage-fear in non-existent. And, since my childhood, I was always encouraged by teachers to write my own amswers to literary subjects as opposed to reading answers written in companion books and teachers' notes. Years of practice made me better. You would think that the skill of literary answer writing in middle school does not translate well into writing technical blogs, or project/grant proposal. You would be wrong. Many skills are general to writing. What I suggest is that you begin reading non-fiction books in the areas that interest you. Start blogging. It could be about anything. Then improve your writing quality through iteration. Iteration is the only way to improve your writing. Generally read more. Read _anything_. Same goes for speaking. Join a book club. Or any Clubhouse room with a topic of your interest where things are well organized. Prepare speeches. Talk. Seek brutal feedback. Take any opportunity to speak and write. I must warn you that these things take time. You will not be magically better after one month. You can see progress after, say, six-seven months. And if you are in the correct path, you will feel world-encompassing cringe in your writing and speeches from six months back. This is the way. Think of a timeframe of five/six years. Be focused. Your speaking and writing will be completely transformed. Pro tip: many people speak and write to woo an audience, project themselves as something they are not, impress peers, etc. Their effect is limited to only a small (and often insignificant) portion of people out there. The only important goal of writing and speaking is communicating your thoughts, feelings, knowledge, intuition, and so on. Everything else comes later.