Things that made me smarter in the last couple of years

Introduction

I was using Vim/tmux before I switched to Spacemacs (my conversion was fuelled by the fact that I could still use the ergonomic keybinding of Vim while taking advantage of all the extra features offered by the Emacs ecosystem. I also discovered emacs lisp and prefer it over Vimscript).
I was using Wunderlist before switching to org-mode (when it got acquired by Microsoft I decided to look for alternative and org-mode seem like a future proof choice).
I was using wikidot for my personal wiki and I switched to org-wiki naturally.

Out of curiosity and to increase my understanding of Emacs I started to learn some Lisp. Initially Emacs Lisp then Common Lisp to finally discover Clojure.
I enjoy watching Baggers videos.
I am using Clojure to play with Overtone and Quil.

I started to do some of my planning and brainstorming with Mind Map. Having my ideas represented visually allow me to think more effectively.

Everyday I read a few articles from Hacker News.
I read a lot of articles from Wikipedia by chunking them by section (I can spend a few days on one article if it has a lot of sections so this reading methodology has some spaced repetition caracteristics).
I organize my online reading through topical folders where I have 2 folders per topic (FOCUS and FUTURE). I dump every new items in the FUTURE folder and choose from it when I am finished with an article in the FOCUS folder. I try to limit the number of items in the FOCUS folder to less than 5. I have currently around 5-6 topical folders...

I configured a newsletter subscriptions feed in my mailbox using a dedicated email address that get redirected to my main email address and filtered into a specific folder.

I write a daily journal of the important stuffs that happen the day before. I then review these entries and organize them into my weekly journal.
I maintain a few other journals also (Gratitude Journal, Emotional Diary, Open Questions, Open Problems, Decision Journal, Forecast Journal and Error Log).

Distilling and organizing my thoughts decluster my mind and therefore make me more effective.

I try to do a deep thinking session every month where I either focus on solving a hard problem in my life or use something like the Cartesian doubt to get out of local minima...

I work on improving my Mandarin, French and English vocabulary daily (using mnemosyne flash cards).

I use IQ Mindware (I do Dual N-Back on and off; it's hard not to feel like you are not wasting your time while n-backing but it is fun from time to time).

I train daily (Prisoner workout if I am limited in time or space). My traning include a 20-30 minutes session of either martial art, BJJ Mobility, Joint Mobility, Wim Hof exercise routine, bodyweight training or Kettlebells and I finish off with 10-20 minutes of stationary cycling.

I meditate on Drone Music for about 20 minutes using Ekagrata (focusing on one object).

I do a respiration session after my daily meditation (I use a technique based on the Wim Hof Method).