Choosing a key switch when limited to online resources can at first seem intimidating. The choice to use a specific switch is highly individual and based on the specific wants / needs of a user.
If you aren't super picky and a new user, a common recommendation are Cherry MX Brown or equivalent switches. They offer both the benefits of a mechanical key switch (more precise and reliable) as well as a familiar tactile "bump" and actuation force common on most membrane keyboards.

However, if you would like to do more research, there are a couple ways you can accomplish this online only.

1. The official website: A brands official website (https://www.gateron.com/ and https://www.cherrymx.de/en) will often describe the switch using common language and terms (actuation force, tactility, sound, etc.), this can be helpful for comparing the details of different brands and their individual switch types. 

2. Individual reviewers: Keyboards are often both a gamer and pc enthusiasts favourite accessory, as such there are a plethora of different reviews for all types of keyboards, keyswitches, and even different "mods" such as rubber dampers and keycap weight. Keyboard content is truly endless.

3. In person: I understand you would like to shop online, however keyboards are frequently on display at different stores which can give you a feel for what you could be getting yourself into before purchasing a keyboard elsewhere.

While trying out switches in person is ideal, these alternative methods can help you make a more informed decision when purchasing a keyboard online. It's also worth noting that many mechanical keyboards offer hot-swappable switches, which allow you to easily swap out switch types without having to purchase a new keyboard.
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