Step 1: Check if you already have rust installed on your hardware. If you do please go to step 2, if not go to step 1-2.
$curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
After the installation run Step 1 again to confirm and go to Step 2 when Step 1 is completed. Or follow the official Rust website @Rust.
There are 3 parts to Step 2. *Lighthouse builds on Linux, macOS, and Windows (via WSL only).
Step 2-1: Download Lighthouse Client
$git clone https://github.com/sigp/lighthouse.git
Step 2-2: Go to the directory of the Lighthouse Client.
Step 2-3: Use Rust to install Lighthouse Client. *Note: This step may take 30+ minutes.
Finally check if the installation is done.
Official website @Lighthouse.