Where to learn sindarin?

Where do i learn sindarin, i tried several sites and some say different things and i don't know where i can learn the real language

Realelvish.net is the best for learning Sindarin. It is the most accurate and up to date, and is also accessible for all linguistic abilities.

Thank you

there's not the tengwarin form though, anywhere i can find it?

The Neo-Sindarin textbook by the webmistress of realelvish.net can be viewed (at least in part?) at books.google.fi

The formation of the Plural Nouns (by myself): arcanaverba.neocities.org

Eldamo's Sindarin section: eldamo.org

There is a very educational forum discussion about Tolkien's late view of the Sindarin future tense (hopefully readable until April 2, 2019) at plus.google.com

When it comes to creating compound words and names (i.e. the question "what will -x+y- sounds produce?"), the second best thing after owning Salo's book "A Gateway to Sindarin" is the website www.tolkiendil.com

The classical mode for writing Sindarin with Tengwar: tolkienonline.de

The mode of Beleriand: at.mansbjorkman.net

There is also the brilliant Discord server Vinyë Lambengolmor where one may find many a brilliant Elvish linguist. You can ask questions about the languages, try talking/writing in them to others and submit work.