Can I get mutation done of my newly purchased land and then change land type?

On 25th March, 2021 I have purchased a land by registering a sale deed on A.D.S.R. Matla, Land area 2 kattah Price 230000 Paid on account payee Cheque on the name of Seller. Cheque no. Mentioned in deed and seller declared he is the only owner and there is no case or loan going on this land. Today on 31st March, 2021 I checked online, my sale deed is showing registered. Showing my name as buyer on records. My questions being a 26 years old and first time property buyer. 1. Can I get my land mutated with the sale deed? 2. Can the seller resale the land to someone after the deed is registered? 3. Can seller's son or daughter or wife in future claim the land? 4. The Mutation record says the name of 2nd last Sellers name on online records. ( Mr. X sold to Y, Y sold to Me, land mutation record shows Mr. X's name on records) Will be a problem in future? 5. Can I change my land type from Shali to Bastu after getting mutation certificate? 6. I purchases total of 1440sqft land (2kattah) am I allowed to build house in 1000sqft of it? I know I am asking so many things, but If I get in trouble, or cheated, I will be doomed. Please help me sir.