How do you think can someone work on their communication skills from scratch and work towards being an effective communicator ?

Communication skills always start with listening. Be a good listener, watch videos of good speakers, and eventually, this will increase your communication skills, after which, you can start reading.

Listening and speaking are one of the most effective ways to learn to communicate after which you can always start with short talks. 

Firstly, one should have a mindset/intention to communicate to express his ideas and thoughts to others rather than have a fear of being judged. Be a good listener and show that you are interested in the conversation and also learn to empathise. These two are the necessary steps as per my analysis. Once you work on these two; understand your audience, and communicate according to the knowledge and skill set of the audience, avoid jargons—crisp and clear communication rather than beating around the bush. Develop the habit of rephrasing or re-clarifying. Most importantly practice these skills with conscious efforts to improve your communication skills.

Working on all skills simultaneously will help someone to achieve this goal. A lot of listening followed by reading will give excellent exposure to the language. It will have to be accompanied by brushing of essential grammar topics as well as vocabulary enhancement activities. Then a lot of speaking in the form of conversation and the communication will be completed through writing skill development.

Working on communication skills is not that tough. First, it's essential to understand why it's vital for you and then to find a mentor who can guide you where you are lacking. There are a few activities, but the most appropriate is speaking to yourself. Please give yourself a dose of 10 sentences every day thrice whenever it suits you.  

Hi Sharad, communication skill depends on the confidence towards the content what you are going to deliver and to whom. For that, the powerful tool is to gather most information as possible through reading, listening and speaking to relevant people with the same knowledge. And to have a long-lasting presentation, one should be easily understood by the target audience. Keep your language simple, straightforward, and most importantly, it should be friendly.