This is a book tip for a bit advanced students.
Say you know 500+ characters but still lacking some very practical and essential vocab but certainly not basic stuff.
I found two great little vocab books. They are for Chinese people to learn English. But I found they are awesome for the other way around, as well (as this is with many of those books). There is no bopomofo or pinyin, so you need to look up characters you don’t know yet (I see this as an advantage to quickly learn more characters).
Anyway you can find them at the bookstore at Nanyang Street. Walking south from behind the tall Xinguang Sanyue building. The store is at the left side. At 1F, against the left wall when walking in.
These 2 books I bought are titled “Wanyong”, 萬用. They’re discounted. Get them before sold out. Just a bit over 200NT$ per piece.