Reading books is better than text-based websites. Why? Because even text-based HTML websites could have links which might distract you more than you intended. One way to prevent that is preserve the one tab rule for browsing but still it could be distracting. I prefer pure text files or markdown files opened in browser. Even if there are links, it wouldn’t be directly clickable so less distracting. While reading anything, you must not forget your line of thought, or thought process which will help you to not get influenced. Think about your reality, your life, your problems while reading anything. Think about how this relates to you. Self-evolution should be a priority above all.