what is 1 volt and 1 ampere? May sounds very basic but its deep. please help
Facts corrected:

Charge of 1 electron is \$-1.6 \times 10^{-19}\$ Coulomb.

The single electron in the valence shell (fourth shell) of Copper (for example) is far from the nucleus (in atomic terms) and it can become a free electron with the application of little external energy.  You just have to overcome the attractive energy of 1 proton.  This energy can be Electromotive Force, heat, light, etc.

Loss of one electron by atom, create a positive ion.  All atoms want to be neutral.

Current flows only if there is source of Electromotive Force and a complete circuit.


Questions:
The source of energy which causes electrons to be free is Electromotive Force, measured in Volts.  EMF causes free electrons, \$Cu^+\$ ions attract free electrons, repeat.  Individual electrons may move small atomic distances, but current is the net flow of electrons.  Current is just the flow of electrons from atom to atom.
1A is defined as 1 C/s.  If you can get \$6.242 × 10^{18}\$ electrons to move through the cross section of wire in 1 second, 1 A of current flows.  1/2 a second, 2A.
Fact 1 says charge of 1 electron is \$-1.6 \times 10^{-19}\$ Coulomb.  It cannot lose this charge.  It is what defines it.  As it moves through a lamp, it creates heat.  The heat in the lamp, creates light.  Power in 1 W = 1 J/s.
So the energy lost to Cu wire is small compared to energy required to force electrons through a resistive lamp made of nichrome (alloy of nickel, chromium and iron) (Resistivities @20°C, Cu: \$1.72 \times 10^{-8} Ω \cdot m \$; and nichrome: \$100 \times 10^{-8} Ω \cdot m \$).  Losses would be proportional to each components resistance.


EMF and volt. As you mentioned EMF is the one which causes free electron. How can we guide this free electrons to move in specific order. While clarifying this can you please explain what is voltage and what is the difference between EMF and voltage. What is potential difference? Thank you very much in advance.

The negative terminal of a source (battery) can be considered a bucket of electrons.  Likes repel, so electrons are forced away from negative terminal.  Similarily, opposites attract, so positive terminal attracts free electrons.  Electron Flow Current is the name for electrons moving from - terminal to + terminal.  That is the reality.  Conventional current (named to reflect the opposite to Electron Flow) was postulated during the discovery of electricity, where the carriers are positive and current flows from + to -.
This explaination for DC works with ac, just that current reverses 120 times a second for 60Hz.
EMF is a source of potential difference, which when applied a circuit is consumed by the components.  In a battery, a chemical reaction takes place, where electrons are removed from positive terminal and held on negative terminal.  If it is an alkaline battery, the negative terminal has a potential of -0.75V and the positive terminal +0.75V.  The potential difference is +0.75V - (-0.75V) = 1.5V.  We commonly do not use potential difference, but rather just voltage.  The battery has 1.5V.
When a source is applied to a circuit, the potential is consumed by the components.  If we apply 1.5V, the circuit consumes the 1.5V.  All of the voltage drops in the circuit will add up to 1.5V.  Either way, we call EMF and voltage drops, just voltage.
Aside from that, as Tony says, ignore the physics and deal with V, A and Ω.  The metric system allows you to go to compatible units, but it is easy to become confused.