Anyone knows like an app or something that notifies you when bitcoin is increasing or falling? Would be very usefull if you don't check it everyday.

Most crypto portfolio apps like Blockfolio[1] and Delta[2] has this feature.

BTW, anyone knows a tool in which you can convert euros in bitcoins, euro in usd and a lot more (no website but software)

If your country supports Coinbase[3], then I'd suggest using their app.

I will try your advice, I thank you before, because I am still not proficient in trading. Hopefully this is useful for me.