I have found Evernote very helpful. It allows you to create shelves, notebooks, and pages so that you can keep various lists and thoughts on any number of topics. It also allows you to tag everything. It has helped me be more organized and it has been very helpful because it is always with me and accessible. Actually, the first draft of this post was written on Evernote over the course of a few days. [free]
Advice: Use Evernote. And take the time to learn from the tutorials. It will be worth it to organize your notes and be able to find and track your thoughts.
I have found this app very helpful. You can save articles in Pocket, tag them for quick recall, and even share on social media. My favorite thing about this app is that it will read to me! I can now drive and “read” articles. [free]
Advice: Don’t spend all your time pocketing things, actually read stuff. Second, there’s no way to underline or make notes so screenshot the parts you want to capture and add them Evernote.