Thanks for answer it helped me a lot. !

I ´ve succesfully installed bincoind and bitcoin-cli. I´ve been using Electrum until now, and I´m still learning how to use these clients from command line but by the way it seems it goes fine. Having my computer always on I came up with the idea of having a full node running, it would be no problem for me and helpful for the bitcoin network as I ´ve been reading: but that´s the point: I got several questions about it.

One first thing: I learned how to compile and use these clients from an O´reillys book. At some point it tells me to run bitcoind in the background by typing: bitcoind -daemon, I do so and block chain begins to download: by typing getinfo  I can see how many blocks are known to my client on the line “blocks”… that´s ok for me. But what happens at the end?. I don´t see that bitcoind reports me anything once I see by typing getinfo that blockchain is already on my computer. So, as a user, why I need to download this large file?. I´ve been reading that having the blockchain on your pc allows you to make transactions in a safer manner, what should I do next?. What kind of things should I type or configure?. Or what kind of special things can I do having a copy of blockchain with these programs?.  Should I install bitcoinj or bit coin server?. How can I run a full node?.



Hope I don´t bother you with so many questions, and thanks in advance to those who could help me with this. Merry Cristmas and best regards.