How to track the bitcoins I spent? I'm studyng the transactions and how they work.
Suppose I would track some bitcoins that I spent.
This is a scenario:
My pubblic addresses are: addr1 and addr2.
I made a transaction tr1 (output like blockchain.info):

tr1
input addr1 2BTC        output  addrX 1.5BTC
                                addr2 0.4BTC
                                addrY 0.1BTC


Now I would know where will be spent the 1.5BTC that I sent to addrX.
Suppose I use the blockchain.info explorer and the addrX makes another transaction tr2.
What I do is:

1 - search for the addrX,
   2 - find the tr2 where my input of 1.5BTC is spent
   3 - reapet the first step but with the addresses specified in output of the previous transaction

Am I correct? In this way can I "follow" the bitcoin that I spent?
Many thanks.
Yes, you are correct. This is the way to follow. To easily follow you can use tools like blockseer