Game analysis

Hello,
can you help me to find mistakes und blunders in my game.lichess.org/dkuMKMjl6EAF

There's really only one worth speaking of here, and that was 38. Ra5, allowing the Rooks to go off the board in the endgame when your opponent had an advanced passed pawn far from your king. 38. Rc1 and you would have retained your advantage, to be followed by 39. d6 if Black allows it. If he captures, you have connected passed pawns. If not, you capture on d7 and you'll have connected passed pawns still. One or the other will queen.

I know it was a really good game by me, but this very bad blunder cost me the win. Thank you!!

Here is another game with @WHaTCoLoR58:

@SVWB
From both of the games you posted, it is evident that you understand the basics of positional play. You got hold of how to position your pieces. Additionally, you seem to understand basic plans in the middle game; the importance of the centre, and so on. I think you should work on your tactical skills. You often oversee basic tactics. This is also reflected in your low rating in blitz and bullet relative to your rating in rapid, which is pretty decent.

Oh, danke.
Du bist ein sehr guter Spieler also glaube kann ich dir glauben. Ich werde mich versuchen bei Taktiken zu verbessern. Meinst du, dass man nur durch Taktiken auf Lichess sehr gut werden kann? Oder sollte ich mir ein Taktikbuch kaufen? Könntest du mir vielleicht noch andere Tipps geben um mich in meinem Schach zu verbessern? Auf jeden Fall danke ich dir jetzt schonmal für die Mühe, dass du dir die Partien und sogar mein Profil angeschaut hast um mich zu verbessern.

Du hast geschrieben, dass ich die Basis des positionellen Spiels kenne. In der zweiten Partie allerdings komme ich schlecht aus der Eröffnung liegt es am positionellen Spiel? Wie kann ich es verbessern? Im Prinzip waren es nur 2 Fehler.

@SVWB
Let's stick to English so that others who come across this thread might benefit as well.
Once you understand the basic tactical patterns, it's completely OK to do tactics on Lichess only.
However, you should take them seriously, i.e. not blitz them out, and even more importantly analyse why you went right or wrong.

Oh thank you.
You're a very good player so I believe I can believe you. I'll try to improve my tactics. Do you think that tactics are the only way to get very good on Lichess? Or should I buy a tactics book? Could you give me any other tips to improve my chess? In any case, I thank you now for the effort that you have looked at the games and even my profile to improve me.
You wrote that I know the basics of positional play. In the second game, however, I don't get off to a good start. Is it the positional play? How can I improve it? In principle there were only 2 mistakes.

Ok, thank you.
Did you mean with ,,analyse" my games or the tactics?