I have done hiragana and I am trying katakana but is this app good for helping me remember I was going to use tofugu at first but wanted to try something new and if I use this app for katakana should I do some other method with it like writing or other ways to study katakana
Renshuu does a pretty good job with kana, I think about as good as any other app or website, but its real strength is what comes next. The same system used to learn kana is also available to learn over 6000 kanji, tens of thousands of words, thousands of sentences, and hundreds of grammar rules.
You absolutely should supplement your study with reading and writing practice though. There is no substitute for that.
Ok I will try but can you give me like a beginner guide for the app it's kinda complicated also is there some other method I should do while doing renshuu
Tap the (?) in the menubar and watch the beginner videos and read the top questions and anything else that seems interesting. Let us know if you have any questions.