Three things I kept rebuilding by hand until it was quicker to make them properly. All run in your browser — nothing to install, and nothing you paste is uploaded anywhere.
Paste JSON from any API and get JSONPath expressions, or a complete ready-to-import template with Low Level Discovery. Nothing to install.
Estimate the storage a Zabbix instance needs from item count, polling interval, and how long you keep history and trends.
Answer a few questions and get a sizing recommendation: NVPS, database growth, per-component hardware, and a diagram of the setup to build.