The pros did a good job setting it up, it's beautiful!
Welcome to the hobby!
You're already off to a great start, with the tank set up and that you're keen to care for them well and willing and wanting to learn more. From my time on this forum, people with your openness to learning and wanting to care for them well tend to be successful.
The advice above is really solid. Just a couple of notes to add - if you're concerned or curious about something, you're always welcome to post here and ask! There are a few handy experts around, and a lot of experienced hobbyists here who are happy to give advice where they can. There is a lot of misinformation online when you google things about fish. Lots of random blogs and articles giving inaccurate and conflicting advice, which can get quite confusing and overwhelming when you're new to the hobby.`
Seriously Fish is a reliable resource written by scientists and experts in the field, and they have profiles on pretty much every fish you're likely to come across in the hobby, with accurate info about their needs. Water parameters/tank size needed/temp/whether they're suitable for a community tank etc. So always worth remembering the source when trusting info.
But if you do your tank maintenance and a 40-60% water change once a week, and don't overstock the tank (and yours isn't overstocked), and quarantine any new fish you get, those are the important things.
First thing I would recommend is buying API test kits so that you can test the water parameters regularly as outlined by Lillypad101. It's pricey but worth the outlay and lasts ages.
You also need water conditioner so that you can dechlorinate your water each time you do a water change. Instructions are on the bottle so you know how much to add for your tank size.
Get some fertiliser for your plants, not sure what's available in your country, but some common ones are TNC Lite, Seachem Flourish and API Leaf Zone (they're not all as good as each other but sometimes it depends what you can get hold of).
Amazon is pretty good for selling everything I've outlined above.
Please don't take this as a criticism
@Lcc86 , it's not directed at you at all! And you're right, Amazon is definitely handy for many of the things we need, and it's so easy to just order stuff from there (and often cheaper), rather than make a trip to your local fish store (LFS). But I also want to urge people to support their local privately owned fish shops by buying things we need from them as much as possible! Large chain stores and online ordering are killing off our LFS.
Fish hobby stores were already not a business that make the owners rich, and they operate on a knife edge. My LFS had to close down because they were just losing too much money, and it's such a shame. They're usually run by people who love the hobby and become a hub for local hobbyists, so you meet and network with other fishkeepers in your area, get fish that the large chains don't tend to stock, and if it's a good store, they deserve your support to remain open, if you have the resources, of course.