For ISO and IEC stuff, I keep an eye on updates from the relevant technical committees.
For the FDA, I look at consensus standard lists.
For the EU, I look at harmonised standards lists.
For the UK, I look at designated standards lists.
I also follow the CDRH news, Europa News and MHRA News for new guidance or upcoming regulatory changes.
I also follow IMDRF News, Team NB News (also Team AB once they are set up), Emergo News, Regulatory Rapporteur, RAPS Regulatory Focus, ABHI Resources MedTech Europe and GHWP/AHWP.
I have each of the pages assigned to a Distill account (other page trackers are available) and check them every few days; however, I work as a consultant and not under ISO 13485, so I don't have to validate my software. If I did, instead of validating Distill, I would just open each of the webpages listed above once per week, look for any relevant news, then use a spreadsheet or similar to record what was relevant and any improvement actions I added to my improvement log, then sign off the update to the spreadsheet.