Pick a Domain property, not a URL prefix
Domain properties cover every subdomain and both http/https in one. They require DNS verification (a TXT record) but it's a 5-minute one-time setup that saves duplicate properties later.
Submit your sitemap on day one
Sitemaps don't guarantee indexing but they accelerate discovery. Submit /sitemap.xml under Sitemaps and check the 'Discovered' count matches your real page count within a week.
Set up email alerts
Settings → Email preferences → enable everything. You want to hear about manual actions and crawl drops the day they happen, not the month after.
Connect to BigQuery for keyword data beyond 16 months
GSC keeps 16 months of data. The Bulk Export to BigQuery is free and gives you forever-history for keyword and page-level analysis.