Actually, cacti are a bit harder to keep alive than they seem. People tend to think "well they grow in the desert, they must be pretty sturdy", but the reality is that they're highly specialised to live in arid condiions. Place your cactus in a jungle, it will never survive. Cacti require
tons of light (especially direct sunlight), and as little water as possible. Most people tend to give them not enough light and/or too much water. (Also, you have to account for seasons and the lenght of day, intensity of sunlight, weather, etc.)
If you're a pure beginner in the domain, theses are the plants that I suggest. They all have a very high tolerance to lighting variation (they'll grow even in shade, albeit much slowly) and except for the first one, are as sensitive to overwatering. But for the vast majority of plants, it's better to water too little than too much anyways, and less light means less water (again, accounting for seasons and such). If you're unsure if you have to water or not, wait a day or two before checking again. And always check for stagnant water in the pot. Plants don't like that.
Pro-tip: if your plant becomes weak, collapses and/or loses foliage, it can be a sign or thirst, but ALSO can mean it's being overwatered. If the plant looks sickly and the soil is wet, empty any stagnant water that may be left, increase lighting if possible and let the soil dry before giving a light watering, letting it dry each time until it recovers (which may or may not happen).
Sanseviera species
One of the sturdiest plants ever. It's so unkillable that you could plonk it in your wardrobe for a month and it will survive. Prefers lots of light, but can tolerate shade. Direct sunlight is fine but check for burn marks on the leaves. Let soil dry thoroughly between waterings, especially in winter of if placed in a shady area.
Zamioculcas zamiifolia
Also called ZZ. Another extremely resistant plant that tolerates all ranges of ligthing, including artificial light (it's a popular plant in shopping malls for that reason). Requires a tad bit more water than
Sanseviera, but again, let soil dry entirely between waterings.
Scindapsus and
Philodendron
The picture above is a golden pothos (
Scindapsus aureus), but both geni (genuses? genus?) have more or less the same care. Tolerates shade, but will have longer stems and less leaves than in medium to bright light, and variegated varieties require a bit more light than plain ones. Prefers a slighthly dry soil over a wet one (avoid overwatering). It can also be grown as a climbing plant or a a cascading one.
All these plants are toxic, so be careful. If you have pets (or young children), then it's better sticking to cacti or try this one
Peperomia species
Pictured above:
Peperiomia obtusifolia, but there exists a lot of different varieties with differently shaped and coloured foliage. Requires medium, indirect light. Avoid direct sunlight, water when dry. As with all others here, avoid overwatering. This plant has thick leaves and can keep its water for longer. Also, fully non-toxic, yay!
That's about it for now, but never hesitate to go to a local flower shop and ask them for tips and whatnot. And don't worry, we all know that all the plants we sell might not survive the month, we mostly make sure people know what to expect, and try to cater to their abilities and conditions at home