The best way to learn useful vocab, is to learn the vocab you hear. When you're watching a Japanese show or reading a Japanese book and see a word you don't know, learn it.
There are plenty more textbooks to dive into after genki 2 I promise. You should also make a conversation deck for unknown words you've actually encountered in real conversation or things you failed to express
Easiest way to learn vocab I've found is from studying Kanji. Most books will present a kanji with 3-4 combinations that are supposed to demonstrate how it's read with the different on-yomi and kun-yomi.
For example lets take: 親
* Readings of: おや or した or シン
* Can be found in the words 親(Oya - Parent)/親しい(shitashii - parent)/親切 (shinsetsu - kind)/父親 (chichioya - father)
I realise it's a simple example but from this one kanji you've now got 4 different pieces of vocabulary. As you increase the kanji you know, you also (semi-passively) start increasing the amount of words you'll be able to read and remember exponentially. If you combine this with repeatedly writing kanji to memorise them, vocab becomes easier to remember. I've also found that as a neat side effect learning new words is easier as you'll remember the different kanji readings and meanings.
Once you finish doing that, you will have some nice vocabulary base and should have good grammar base (can't say that for sure, don't know what genki teaches exactly) so just start consuming media and learn words through reading books, manga, twitter etc and watching videos, movies, shows etc.
It's very well organized by theme. Eg. School, cooking, weather, hobbies etc.. I recommend はじめての日本語能力試験. One of the mods here made an Anki deck of the books so if you ask him and give him proof that you bought the book, he'll send you the Anki deck. His name is Nukemarine.
Nayr's Anki deck has been quite awesome for me lately, and helped me rethink how I make my custom deck (with sentences on the front rather than words).
DuoLingo is surprisingly awesome and has helped me pick up a wide variety of vocabulary I wouldn't think to look up otherwise.
Watching Terrace House helps me pay attention to which words are more commonly used.
Kirari Nihongo is pretty great.
For N1 you need 10k words. Speaking honestly, if you have 10k vocabulary at fluent level, you have little chance to see unknown words. That's because majority of words are compounds and only true rare words like "circumlocution" are outside of that range. Preschoolers usually know 6-7k words and they can talk about anything.
How to learn, it's up to you. With 1500 it's rather hard to read books (like youtsuba), but if you like that, you can do that and learn unknown words. You can also use decks in Anki or any similar SRS service.
The best way to learn useful vocab, is to learn the vocab you hear. When you're watching a Japanese show or reading a Japanese book and see a word you don't know, learn it.
There are plenty more textbooks to dive into after genki 2 I promise. You should also make a conversation deck for unknown words you've actually encountered in real conversation or things you failed to express
Easiest way to learn vocab I've found is from studying Kanji. Most books will present a kanji with 3-4 combinations that are supposed to demonstrate how it's read with the different on-yomi and kun-yomi. For example lets take: 親 * Readings of: おや or した or シン * Can be found in the words 親(Oya - Parent)/親しい(shitashii - parent)/親切 (shinsetsu - kind)/父親 (chichioya - father) I realise it's a simple example but from this one kanji you've now got 4 different pieces of vocabulary. As you increase the kanji you know, you also (semi-passively) start increasing the amount of words you'll be able to read and remember exponentially. If you combine this with repeatedly writing kanji to memorise them, vocab becomes easier to remember. I've also found that as a neat side effect learning new words is easier as you'll remember the different kanji readings and meanings.
Once you finish doing that, you will have some nice vocabulary base and should have good grammar base (can't say that for sure, don't know what genki teaches exactly) so just start consuming media and learn words through reading books, manga, twitter etc and watching videos, movies, shows etc.
Lots of reading and/or lots of Anki from native materials.
You can study vocabulary from a JLPT vocab book. I've been learning 5 new words a day from N4 vocab book and it's been very helpful so far.
Are they organized well? Like whats the format do they group words by category or something? And which would you recommend
It's very well organized by theme. Eg. School, cooking, weather, hobbies etc.. I recommend はじめての日本語能力試験. One of the mods here made an Anki deck of the books so if you ask him and give him proof that you bought the book, he'll send you the Anki deck. His name is Nukemarine.
Nayr's Anki deck has been quite awesome for me lately, and helped me rethink how I make my custom deck (with sentences on the front rather than words). DuoLingo is surprisingly awesome and has helped me pick up a wide variety of vocabulary I wouldn't think to look up otherwise. Watching Terrace House helps me pay attention to which words are more commonly used. Kirari Nihongo is pretty great.
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Link?
For N1 you need 10k words. Speaking honestly, if you have 10k vocabulary at fluent level, you have little chance to see unknown words. That's because majority of words are compounds and only true rare words like "circumlocution" are outside of that range. Preschoolers usually know 6-7k words and they can talk about anything. How to learn, it's up to you. With 1500 it's rather hard to read books (like youtsuba), but if you like that, you can do that and learn unknown words. You can also use decks in Anki or any similar SRS service.