android - Tags in app & legal content -

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i beginner in android , want ask u few questions:

1: there tag make app easier find in google market when searched ( meta tags in html) ?

2: i've created math application in native language. couldn't find on market other apps looks similar or in same language, found many others in english or other languages.

is legal put app on google market ?

i've searched on google developers didn't find this. if u can give me link google great. also, can put name on bottom of app?

and last question have, way earn money free apps without using adds?

thank in advance!

for first question, can research on subject of google play seo:

but there's no "secret formula" of kind. also, remember "dumping" keywords in app page's description not permitted.

as second question, don't see reason app not legal if coded yourself, isn't' blatant copy of 1 else's app , obeys google play's content policy.


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