So  readbtc.com, the site is talking about altcoins more than BTC "No lightning networks, Bitcoin core, nodes, wallets courses."
I've read some articles and most of them seem to be from last year "not updated especially that talk about prices" and the information they contain can be found by searching online. "$ 49.00 per month appears to be an expensive amount."
I advise you to publish the names of the writters who provide the courses or to give some free subscriptions to trusted members.