Can somebody please help with these 2 words

Sensin
Seninde

Thank you

Sensin
->it's you/that's you/-is you

The one i love is you
->Sevdiğim(kişi) sensin

That's you in the photo.
->Fotoğraftaki sensin.

Senin(ki) de
(seninki=yours)

(here "de" should be written separately because it means "too" which as a rule is written separate)

->you too/yours too

you too actually means "sen de" but sometimes "senin de" also is used(and suitable) in English translations.

A:Your toy looks beautiful
B:Yours too

->A:Oyuncağın güzel görünüyor.
B:Senin(ki) de

A:Bayramın mübarek olsun.
B:Senin de

->A:Have blessed bairam(religious fest)
(Literally :may your bairam be blessed)
B:You too
(literally :yours too)

i hope you get the point...

Thank you so much it really helps to make things clear.