Hi

top of videos in classes would say in top right corner if starter, premium or premium plus see image. If you trying a yellow crowned video it will ask you to upgrade.

Hi - there are two levels of premium membership. You are standard premium, and can only watch the weekly webinars that have a purple diamond on them.

There is a premium plus membership which is $99 per month and this allows you to watch further videos from industry experts. These are denoted by having a yellow crown on them.

Let the content flow naturally. Don't overdo it. But most people don't read entire posts/articles, they skim them and look for relevant information. Once they get what they are looking for they either leave your site (bounce) or click a link to learn more. Spread them out so that people have options to click on for more information throughout your post. Just do it naturally. Generally I typically shoot for 3, no more than 5 and that's only if I use image banners to link to it as well. But each niche, article can be different.

Quality link is key, if the link is bad (low quality), from what I know, it may affect your SEO optimization

As it is needed so it does not depend on the counting.

See here How many links per page is too many?