Effectiviology - This is a great blog that takes an analytic approach to relatively basic but important concepts. Their newsletter is worth considering, as they send out only succinct and useful information.
QualiaSoup / TheraminTrees - Two accessible channels that discuss specific philosophical and psychological subjects.
List of Cognitive Biases - A list of tendencies that we all have, important for building awareness.
List of Logical Fallacies - A list of common reasoning errors, great for better understanding why arguments are good or bad.