Investors & landlords

thank you so so much for your detailed answer. As a newbie, I'm trying to understand here. So my house was closed on Dec 10th, on Dec 14th we put on sign for available for rent, but my tenant moved in Jan 15th and I got my first payment in Jan. For this case, can I say number of days rented as 17 and rental income 0? or I should enter vacant period? (I didnot find where to enter vacant period for rental property in TT though).  also for property improvement (I added gutter), it is under 2500,  shall I use "safe harbor di-minimis"?