A Bitcoin Node is not a Lighting Node:
A Bitcoin Node Needs Only 5GB of Disk Space & a Internet Connection To Function.
But A Lightning Node Needs 1TB of disk space & Uses a Bitcoin Node To Function. These are often the raspberry pi's you see for sale or in pictures sometimes. You do NOT need these to run a Bitcoin node, or a Full Bitcoin node.
Both of these have different functions and purposes that you can read more about using google.
More on the difference between a lightning node and Bitcoin node here:
https://bitcoin.stackexchange.com/questions/78733/full-node-vs-lightning-node
A few sources for downloading the Bitcoin core reference implementation for free:
https://bitcoin.org/en/bitcoin-core/
You can also run luke-jr's Bitcoin Node Software to accomplish the same thing, He maintains this version of Bitcoin node software mostly on his own, while an army of developers maintain the versions above:
Both of these versions are free, and open source (meaning anyone can use them, modify them, or audit and view the course code: https://github.com/bitcoin).
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