Configure GA4 Conversion Goals

I need to set up Google Analytics 4 (GA4) with proper conversion tracking for my website. Help me configure events, conversions, and a useful dashboard so I can actually understand what's driving results.

Website details:
- URL: [your website URL]
- Framework: [e.g. Next.js, WordPress, Shopify, static HTML]
- Business model: [e.g. SaaS free trial, e-commerce, lead generation, content/newsletter]
- Key conversion actions:
  1. [e.g. "Free trial signup"]
  2. [e.g. "Demo request form submitted"]
  3. [e.g. "Pricing page visited"]
  4. [e.g. "Newsletter subscribed"]
- Current GA setup: [e.g. "GA4 installed but not configured", "nothing installed yet", "migrating from UA"]

Set up the following:

1. GA4 installation:
   - Give me the gtag.js snippet to add to my site
   - Show me where to place it in [my framework]
   - If using Google Tag Manager: walk me through creating a GA4 Configuration tag
   - Verify it's working: how to check real-time reports for my own visit

2. Custom event setup:
   For each of my conversion actions, create a custom event:

   Event: [conversion action 1, e.g. "sign_up"]
   - Trigger: [e.g. "user lands on /welcome page after form submission"]
   - Method: [page_view trigger on /welcome or custom JS event]
   - Parameters to include: method (google/email), source (landing page URL)
   - Give me the exact gtag('event', ...) code OR GTM tag configuration

   Event: [conversion action 2]
   - [same structure]

   Event: [conversion action 3]
   - [same structure]

   Event: [conversion action 4]
   - [same structure]

3. Mark events as conversions:
   - Walk me through: Admin > Events > toggle the conversion switch
   - Explain the difference between events and conversions in GA4
   - Show me how to verify a conversion is firing in the real-time report

4. Enhanced measurement configuration:
   - Enable: page views, scrolls, outbound clicks, site search, file downloads
   - Disable anything that adds noise for my use case
   - Set up cross-domain tracking if my app and marketing site are on different domains: [domains]

5. UTM parameter strategy:
   - Create a UTM naming convention for my campaigns
   - Build 5 example URLs for:
     - Newsletter link
     - Twitter bio link
     - Paid ad campaign
     - Partner referral
     - Product Hunt launch
   - Show me where UTM data appears in GA4 reports

6. Build a useful dashboard:
   Create a custom report with these views:
   - Traffic sources driving the most conversions (not just traffic)
   - Conversion rate by landing page
   - User journey: which pages do people visit before converting?
   - Device and location breakdown for converters only
   - Week-over-week conversion trend
   Walk me through creating each of these in Explore reports.

7. Common GA4 mistakes to avoid:
   - Events I should NOT mark as conversions (and why)
   - Why default channel grouping might misattribute my traffic
   - The data threshold issue (when GA4 hides data) and how to work around it

Give me step-by-step instructions with exact clicks in the GA4 interface. Assume I know nothing about GA4's layout.