Type of mic
There are three basic kinds of mics you're likely to run into: dynamic, condenser, and ribbon. Dynamics are straightforward moving-cone mics, condensers use an electric field, and ribbons use a very sensitive and delicate metal ribbon.
Both dynamic and condenser mics will work great for your purposes, so you don't necessarily have to restrict yourself if you don't want to. Condensers, in my experience, tend to be slightly "crisper," and a bit more sensitive to subtleties, but tend to require "phantom power" from whatever they're plugged into (usually a preamplifier, often built into a mixer or USB interface). I find this sensitivity to be an important quality for music, but for making tutorials where you just want to have a clear, understandable voice, I don't see any advantage over a dynamic unless you specifically prefer the sound of them. Ribbon mics are delicate and expensive and don't offer much advantage to recording voiceovers, so you can safely ignore them for now.
The go-to dynamic mic for many purposes is a [Shure SM-57] or SM-58 (the 58 is the same thing with a different grille, aimed at vocalists). These are often recommended because they are inexpensive (generally under $100 US), work great, mostly hold their value on the used market, and are durable to an almost silly level.
The disadvantage compared to the two mics you posted (which seem fine to me) is that those mics already have the recording interface built in, so you don't need any other hardware. Since I imagine you don't need to do any hardware processing to your microphone signal, having it built in would be pretty convenient.
Directionality
To reduce typing noise, make sure your microphone is directional, and point it towards your mouth (maybe slightly off, experiment for the best sound). A directional mic pics up sound mainly from one direction, so sounds from the other directions are de-emphasized. You can take advantage of this property to reduce keyboard noise. The Audio Technica you linked is directional (it claims a 'cardioid' polar pattern on the Amazon page, which will work nicely) and I imagine the AKG is as well, as it's pretty common. Avoid "omni" or "figure-eight" pickup patterns as these pick up from more than one direction.
Stand/mount
You need some kind of stand for your mic, because it will sound inconsistent as you move around, and because holding it in your hands is a giant pain in the rear, especially when you're trying to type.
For podcasting at home, you probably either want a small desktop stand (like the Audio Technica mic you linked appears to come with), or a freestanding one like this. You'll also need a mount that fits your mic, that screws onto the stand (many mics come with one). If you have the space, I would advise the latter, because an on-desktop stand tends to transmit thumps and desk noise to the microphone, and you're going to be typing a lot. By not having the mic physically coupled to the desk, you can avoid a lot of this.
Many mics have a highpass-filter option which filters out lower noises like thuds and bumps to some extent. It helps, but I'd still recommend a separate stand.
You can also reduce this using a shockmount. They generally look like the one pictured on this wikipedia page. I personally haven't found them necessary for just speaking into, but I felt it was worth mentioning.
Pop filter
The purpose of a pop filter is to help reduce noise from certain kinds of sounds called plosives. These are the popping "p", "t", "b", and other sounds that are annoyingly over-emphasized in microphones because of the little blast of air that comes out of your mouth. A pop filter helps reduce that air movement while keeping the sound pretty much untouched otherwise. These don't have to be expensive or elaborate - nylon hose stretched over a ring works great, as do inexpensive commercial solutions.
