Julian Cole is a quite famous advertising strategist (BBDO) and he recently shared a nice list of free resources for planners/strategists. The kind of stuff you want to bookmark and want to save for a rainy (non-productive) day.
1. 50 Free Data Tools For Planners - https://lnkd.in/dmM2B2n
2. 150+ Innovative Advertising Examples - https://lnkd.in/gy5B8dF
3. 10 Best Strategy Papers - https://lnkd.in/gEa-Ycb
4. Day 1 Advice for New Planners - https://lnkd.in/ga2JWpa
5. Strategy Mate - https://lnkd.in/g59rJus