Feeding
If there is one place where new cat care hobbyists overspend, it is on equipment for feeding. The marketing makes it sound as though the right gear is the difference between failure and success. In practice, the cheapest competent option for feeding is good enough for the first year, and most of the improvement in that year comes from the person rather than the kit.
That said, feeding is also a place where one mid-priced upgrade can transform the experience after the basics are in. Beginners often save in the wrong place and spend in the wrong place. The simple rule: get the cheapest decent version while you are learning, and upgrade only when you can name the specific limitation you are running into.
That is the short version. Cat Care rewards patience more than cleverness, and almost all of the visible improvement in the first year comes from showing up regularly rather than from any single decision about gear, method, or grooming. Most of what is on this site assumes the same thing: that you intend to keep at it, and that you would rather be quietly competent in two years than dramatically excited for two months.