Newsletter providers ( which ones are there, what do they offer, how expensive are they, how easy are they to use). If you then take into account things like "European server location" and connection to WordPress, you can go on a bit of an odyssey until you find something suitable.
Webinar platforms: What do they offer, what do they do, what do they cost? Theoretically, you can of course work with Skype or Google Hangouts, or at least start with them. In bosnia and herzegovina telegram screening practice, however, that was not an option for me.
Video recordings, webinar recordings, live videos (on Facebook, for example). Videos are currently the top trend in social media - there's no getting around it. Even though I personally prefer reading, most people seem to prefer watching videos - so I'm gradually adapting. What I had to learn was editing videos (which then involved experimenting with different programs).
Billing systems. Of course, you can also build an online business by taking orders by email, writing and sending invoices and only becoming active once the payment has been received. But that is no longer up to date. So after a short research I decided on Digistore24* [ advertising link !]. The service is expensive and the support could be better and faster, but the service itself is good. In the meantime (2018) I also use the provider elopage* [ advertising link !] from Germany, whose support is much more accessible than Digistore.