Long run for half marathon training

https://www.superhalfs.com/en/articles/training/7-steps-improving-your-half-marathon-time/

https://runnersconnect.net/wrong-long-run-pace/
https://runnersconnect.net/build-long-run/
https://www.letsrun.com/forum/flat_read.php?thread=5582217

https://www.rei.com/learn/expert-advice/training-for-your-first-marathon.html
https://www.nike.com/running/half-marathon-training-plan