Each profession has associations, publications and networks for people in the industry to share their ideas and experience, and promote their work. The most popular network used by many industries is LinkedIn.
There are a number of graphic design tools which you can use to help you make your profiles and websites look professional. For example, canva.com enables you to develop professional looking posters, leaflets, CVs and profile images for free.
Showcase your work through online portfolios, blogging and vlogging
There are many free blogging websites, with the most common being Wordpress, Blogger and Weebly.
If you are feeling creative you could also record your reflections using video or audio and then share them with the world via sites such as YouTube, Vimeo or SoundCloud.
It is important to remember that sharing reflections online might actually restrict what you write, as it is writing in a public space rather than a private one. You can manage the visibility of your blog using the platform's privacy settings; most websites will ask whether or not you want to make your content public, private or unlisted.
Medium is a place to read, write and interact with content relevant to you. The interface is very simple and straightforward so you can quickly and easily write up and publish a post. Medium automatically generates a user profile to display your published blog posts. As well as this, it is a very comprehensive site for finding articles and blog posts; labels are used to arrange content making it easy to find relevant information.
Audacity is a free open source tool to record, edit and mix sounds. It is quick and easy to start recording, and simple to make edits to a track. You cannot share content directly from Audacity but you can export to MP3 (as well as many other formats) and upload to SOL, a blog site like Wordpress or an audio sharing platform like SoundCloud.