Sorry to tell you mate, but you posted in the Dutch section, not the German one!

To explain the confusion:

There's two languages: Dutch and German. The German word for German is Deutsch, which sounds and looks a lot like the English word Dutch, while the latter is a different language!

Je maakt echt weinig grote fouten! Met geel heb ik alternatieve mogelijkheden aangegeven die ietsjes natuurlijker klinken.

8 - Acht

- About the use of je and jij: Jij is used to really put emphasis on the word. In principle, je is always correct, unless you need to stress the word. If it is not specified who you are talking to or about, or not important, you can use je. Germans would use mann and the English would say one.

For example:

Je kan bij de kassa een kaartje kopen

Jij kan geen kaartje kopen, want jij hebt geen geld

Je kan geen kaartjes meer kopen, want het is na sluitingstijd

I also see that you find the articles difficult in Dutch. Since they don't exist in Russian, they must be awful for you, haha.

Only now I realised that articles are quite a challenge to explain. For example, I corrected you at Het entreekaartje. We would say een entreekaartje (indefinite article) but at the same time de entree (definite article). The best reason for this that I can come up with is that de entree is just a little more specified. There is only one entree, since it is a concept. A concept of payment that you make in order to enter. Kaartjes on the other hand, there are thousands of them, making een kaartje not so definite.

In the following part you write "ik heb ook een zeeleeuwenshow bezocht". You might even say de zeeleeuwenshow, since you mentioned the show in the beginning of your entry. In the next sentence "De zeeleeuwen deden veel trucs..." zeeleeuwen really needs a definite article (de), because it is clear what sea lions you are talking about: those in the show. 

Pretty tough huh?

Nonetheless, your Dutch is very very good! I don't get how you could write all of this while your profile says you are on level A1. Unbelievable!

Zoo in Rhenen, the Netherlands

* Het is netter om een zin nooit met en te laten beginnen. Mondeling kan het wel, maar schriftelijk kan je het beter vermijden.

** Cafés is hier helemaal correct, maar als je nóg meer Nederlands wilt klinken zou je cafeetjes kunnen zeggen. 

*** Dat je het zo spelt had je niet kunnen weten. Het meervoud van amfibie krijgt een extra ë, omdat de klemtoon in het enkelvoud op de laatste lettergreep ligt. Hetzelfde geldt bijvoorbeeld voor idee => ideeën, kopie => kopieën, utopie => utopieën, ree => reeën. Woorden die geen extra e krijgen zijn bijvoorbeeld bacterie => bacteriën, porie => poriën. Bij deze woorden ligt de klemtoon in het enkelvoud namelijk niet op de laatste lettergreep.

Oh, just to add another experience and strengthen my point...

I once met an Italian that had been living in the Netherlands for a couple of years. He actually preferred to speak in English, since he thought (I disagreed :)) his Dutch wasn't as good as his English, but I spoke to him in Dutch. I preferred Dutch because it is simply my native language. In my native language I can a lot of idiomatic expressions and word play you know, that you don't always know in English. Since he did understand all that, Dutch was just the easiest.

In short, I would pick the language that goes best in a certain situation.

In my experience, I will speak the language that is the easiest in terms of keeping the conversation going. I remember from when I was trying to learn Spanish in Spain, that I would always switch back to English whenever I would get stuck in a conversation or if there would be awkward silences.

I guess the same goes for when you speak Dutch in the Netherlands. I reckon a lot of people will find it really interesting that you learn Dutch, but if you wouldn't speak it well enough to keep a conversation going, yes, then I would definitely switch back to English.

Nobody means to be rude, but you know, people very much dislike awkward conversations :)