user17732: I am a complete beginner and have started learning chess one month ago. I play online on lichess.com. I lose a lot of games which is understandable too. 
Many people advised me that I should analyze my own games. I have came across number of online websites(also lichess inbuilt analyzer) that tells me what is the best move.
But I want to know why that specific move is the best move, what are advantages of playing "X" move in comparison with "Y" move etc. 
In short is there a website/engine that decodes the chess moves from me?

user11629: 
Many people advised me that I should analyze my own games.

Good advise, but unfortunately impossible to do for a beginner.

In short is there a website/engine that decodes the chess moves from me?

There is one (see the answer by SmallChess), however I am rather pessimistic about decoding done by computers. 
As mentioned in my comments, for simple tactics, the site mentioned does a pretty decent job explaining the ideas behind the moves. 
In less tactical/more equal positions, however in my experience, it will overload you with fairly irrelevant short term plans missing the long term idea behind it.
If you think you find this or similar sites useful, go for it. Personally I'd recommend to watch/read commented/annotated games (books, or youtube or chess24 or...) and if possible have a stronger player analyze games with you (perhaps join a chess club). IMO, can't beat human analysis of chess.

user825: I was thinking if you were the author of https://decodechess.com, and posted here for self-promotion. "decode" isn't a common terminology here. What you're asking match exactly to the name of the site.
Ok. Please take a look at the site.
I personally don't use it as I found the analysis too simple/too naive. Maybe you'd think otherwise.

17732: <p>I am a complete beginner and have started learning chess one month ago. I play online on lichess.com. I lose a lot of games which is understandable too. </p>

<p>Many people advised me that I should analyze my own games. I have came across number of online websites(also lichess inbuilt analyzer) that tells me what is the best move.</p>

<p>But I want to know why that specific move is the best move, what are advantages of playing "X" move in comparison with "Y" move etc. </p>

<p>In short is there a website/engine that decodes the chess moves from me?</p>
 11629: <blockquote>
  <p>Many people advised me that I should analyze my own games.</p>
</blockquote>

<p>Good advise, but unfortunately impossible to do for a beginner.</p>

<blockquote>
  <p>In short is there a website/engine that decodes the chess moves from me?</p>
</blockquote>

<p>There is one (see the answer by SmallChess), however I am rather pessimistic about decoding done by computers. </p>

<p>As mentioned in my comments, for simple tactics, the site mentioned does a pretty decent job explaining the ideas behind the moves. </p>

<p>In less tactical/more equal positions, however in my experience, it will overload you with fairly irrelevant short term plans missing the long term idea behind it.</p>

<p>If you think you find this or similar sites useful, go for it. Personally I'd recommend to watch/read commented/annotated games (books, or youtube or chess24 or...) and if possible have a stronger player analyze games with you (perhaps join a chess club). IMO, can't beat human analysis of chess.</p>
 825: <p>I was thinking if you were the author of <a href="https://decodechess.com" rel="nofollow noreferrer">https://decodechess.com</a>, and posted here for self-promotion. "decode" isn't a common terminology here. What you're asking match exactly to the name of the site.</p>

<p>Ok. Please take a look at the site.
I personally don't use it as I found the analysis too simple/too naive. Maybe you'd think otherwise.</p>
