I’m very new to computer science so I decided to ask for help here. I have deployed multiple forks from GitHub and every time I have it shows the “you have followed a broken link” message. My website is https://comfy-figolla-6b8bca.netlify.app/ my log is
6:49:47 PM: build-image version: 68a2c262fa3c95a08a1716b8dde8fba0e332ec73 (focal)
6:49:47 PM: buildbot version: 68a2c262fa3c95a08a1716b8dde8fba0e332ec73
6:49:48 PM: Fetching cached dependencies
6:49:48 PM: Failed to fetch cache, continuing with build
6:49:48 PM: Starting to prepare the repo for build
6:49:48 PM: No cached dependencies found. Cloning fresh repo
6:49:48 PM: git clone --filter=blob:none GitHub - jack9192/Nebula: Nebula Web is a stunning and sleek web proxy with support for hundreds of popular sites.
6:49:48 PM: Preparing Git Reference refs/heads/main
6:49:49 PM: Parsing package.json dependencies
6:49:50 PM: Starting to install dependencies
6:49:50 PM: Python version set to 3.8
6:49:50 PM: Attempting Ruby version 2.7.2, read from environment
6:49:51 PM: Using Ruby version 2.7.2
6:49:51 PM: Started restoring cached go cache
6:49:51 PM: Finished restoring cached go cache
6:49:51 PM: Installing Go version 1.19.5 (requested 1.19.5)
6:49:56 PM: go version go1.19.5 linux/amd64
6:49:56 PM: Using PHP version 8.0
6:49:57 PM: v16.20.0 is already installed.
6:49:58 PM: Now using node v16.20.0 (npm v8.19.4)
6:49:58 PM: Enabling Node.js Corepack
6:49:58 PM: Started restoring cached build plugins
6:49:58 PM: Finished restoring cached build plugins
6:49:58 PM: Started restoring cached corepack dependencies
6:49:58 PM: Finished restoring cached corepack dependencies
6:49:58 PM: No npm workspaces detected
6:49:58 PM: Started restoring cached node modules
6:49:58 PM: Finished restoring cached node modules
6:49:58 PM: Installing npm packages using npm version 8.19.4
6:49:58 PM: npm WARN EBADENGINE Unsupported engine {
6:49:58 PM: npm WARN EBADENGINE package: ‘nebula-web@7.11.6’,
6:49:58 PM: npm WARN EBADENGINE required: { node: ‘>=18’ },
6:49:58 PM: npm WARN EBADENGINE current: { node: ‘v16.20.0’, npm: ‘8.19.4’ }
6:49:58 PM: npm WARN EBADENGINE }
6:49:58 PM: npm WARN EBADENGINE Unsupported engine {
6:49:58 PM: npm WARN EBADENGINE package: ‘@tomphttp/bare-server-node@1.2.3’,
6:49:58 PM: npm WARN EBADENGINE required: { node: ‘>=18.0.0’ },
6:49:58 PM: npm WARN EBADENGINE current: { node: ‘v16.20.0’, npm: ‘8.19.4’ }
6:49:58 PM: npm WARN EBADENGINE }
6:50:00 PM: added 149 packages, and audited 150 packages in 2s
6:50:00 PM: 13 packages are looking for funding
6:50:00 PM: run npm fund for details
6:50:00 PM: found 0 vulnerabilities
6:50:00 PM: npm packages installed
6:50:00 PM: Install dependencies script success
6:50:00 PM: No build steps found, continuing to publishing
6:50:00 PM: Starting to deploy site from ‘/’
6:50:00 PM: Calculating files to upload
6:50:00 PM: 0 new files to upload
6:50:00 PM: 0 new functions to upload
6:50:00 PM: Starting post processing
6:50:00 PM: Section completed: deploying
6:50:00 PM: Section completed: building
6:50:00 PM: Uploading Cache of size 1.3MB
6:50:00 PM: Post processing - HTML
6:50:00 PM: Section completed: cleanup
6:50:00 PM: Finished processing build request in 12.793s
6:50:00 PM: Post processing - header rules
6:50:01 PM: Post processing - redirect rules
6:50:01 PM: Post processing done
6:50:01 PM: Section completed: postprocessing
6:50:01 PM: Site is live 
As shown in the line above, you are deploying from the repository root. So all the files in the repository as deployed, such as app.js.
As this is a Node.js project which only contains a start script, it is not a project that will work on Netlify as outlined in this support guide