katakana first ?

Hiragana is the most common character used in Japanese sentences.
But why do I recommend you to learn katakana first?

Katakana is currently used to write foreign words such as English.
So if you understood the resentment, it was useful directly.

アメリカ = a-me-ri-ka = America
バス = ba-su = bus
チケット = ti-ke-tu-to = Ticket
ビール = bi-ru = beer
ショップ = sho-ppu = shop

Hiragana is the most common character used in Japanese sentences.
But during the WW-II, katakana was somehow mainstream.
Therefore, we can read only katakana texts.

In general, it is said that Katakana and Hiragana were created by breaking the kanji.
However, there are people who think that Katakana is the most ancient Japanese character since ancient times.

Some people think that the Japanese are "Ten Lost Tribes of Israel"
It seems that Katakana is very similar to the ancient Hebrew notation.

Oriental characters, like kanji, are easy to write with a brush.
So, as you can see by writing with a brush, kanji and hiragana are easy to write with a brush, but katakana is difficult to write.
So, I don't think katakana broke the kanji.

Furthermore, it is speculated that hiragana was formed first, and next is katakana,
There is no explanation why it was necessary to make two sets.