Change in value of a variable according to the rise or fall of another variable.

[Phylogenius]

@Est_engine

the lower part of your screenshot literally say:

When the Event RechargeEnergie is called do the next node
The Branch ask: : is this condition true Do this nodes, –
Is this condition false Do this nodes –
If was yes, you Set the Variable 2, to Variable 2 +1.

The lost part is Variable 1+1. that not return a condition true or false.
in the search node type int == int > not and
you will get 4 nodes, some of them can be found for any type of variable

Here a simple video about start https://www.youtube.com/watch?v=opsv5wTLcz8

for example, you can check if that variable is X
if is lower than X, greater than X
here the node Greater_or_egual https://docs.unrealengine.com/en-US/BlueprintAPI/Math/Integer/integer_gt__integer/index.html
If you use this node you can check if the Var+1 is greater than another number.
You can combine these conditional stuff in any way.

Search online for starting operation with And , Or, Not, and Equal

Thank you, I am taking all of this as notice.
I solved my problem, the solution can be found here :
https://forums.unrealengine.com/development-discussion/blueprint-visual-scripting/1819403-increment-in-time

God bless you