In "recent" times, we've been seeing more and more tutorials using apt instead of apt-get. Is it the wrong, or the right one?
Nothing wrong using the first or the later... Or both!
apt command arose to usage because it combines the... "best of both!" Some commands we use come from apt-get (such as install) and some other come from apt-cache. (such as search).
Not really the best, but the most popular, most widely-used commands. It is intended to replace both apt-get and apt-cache to just apt!
There's nothing wrong if you decide to NOT use it, and continue using apt-get. In fact, it interacts with the system on a lower level, and this might be more effecient (talking to self: seriously? you talk about efficacy? how much difference can that make?)
If you are in a hurry, you can always type apt instead of apt-get! It will save you a whole lot of... 0.25-0.3sec each time? (Seriously again?)
Image source: 1
I'm sorry if you didn't like my semi-sarcastic tone at the end, I felt like it, and I think it really adds a little something. The GIF is from South Park's episode Cash for Gold (S16E02). Watch it on the official South Park website for free