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 integer >= integer | Unreal Engine Documentation
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