If you do decide to go the podcast route for marketing, matchmaker.fm is great for finding hosts looking for guests. I've done a handful found through there. Source: over 3 years ago

-I use matchmaker.fm and contact directly on Instagram too. Source: almost 4 years ago

For a guest, you have to contact people. Two resources are matchmaker.fm and r/PodcastGuestExchange. It is noticeably harder to get booked as a guest than it is to book guests for your own show. When I was doing booking for a client, I think we had around a 15% booking rate even for small shows within the niche. Compare that to booking guests, where I can average around a 70% acceptance rate. Source: about 4 years ago

It's not very hard to get guests on a podcast. You're right you won't get the huge names, but you can use a service like matchmaker.fm or just find people on social media. The key is to send a custom message that makes them actually feel wanted instead of being spammed. If you do this you will get a pretty high booking rate. Everyone wants to self-promote these days, and once you realize how much harder it is to... Source: over 4 years ago

You can use matchmaker.fm, it's free for a certain amount of messages per month. You can also use /r/podcastguestexchange. Another message is old school email, look up aggregated lists of the shows in your niche, look up the show's website and find their contact information. All of these methods will help you connect with the hosts. Source: almost 5 years ago

In terms of HTML/CSS, I have https://github.com/flancast90/The-Vault (local serverless and encrypted file storage), https://github.com/flancast90/gitmbed (chrome extension for a better GitHub), https://github.com/flancast90/PennyPriceJS (price-finder tool), and my resume site/template (www.finnsoftware.net). Source: almost 5 years ago