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It's a pity it's not corona brewery

I think he works for the department that makes the corona rules , I hope the has enough space for all the changes

If you have recently updated your AutoCAD it is possible that the windows file association is broken. Right click on a drawing and choose "Open With" from the drop down list and ensure it is set correctly.

Might want to check this in your Options... If you are using Dynamic Input, there are lots of available settings here to make it better comply with your aspirations.

There is a snap option for "apparent Intersection". If you leave this on in conunction with "intersection" it isn't easy to discern between the two when you are snapping. Personally, I always disable apparent intersection because of this. But this might be part of it? My recommendation is to make use of orthomode , disabling it for situations where it isn't necessary. This will keep your linework straight.

When you extend a line by using the EXTEND command, there is no provision for inputting any dimension. EXTEND extends an object to meet another object. There is no setting in AutoCAD that accounts for this. However if you use the appropriate command to make a line a definite length, i.e. the LENGTHEN command, then you will have no trouble. Your thread title is plain wrong and might get you into trouble.

Please tell us what command you're using, what options you're using, whether you have snap enabled, and how you arrived at the conclusion that the line's length is wrong. If you specify a point near an object, and you have a relevant snap option turned on, the point you get will be the location you snapped to, not the location of the cursor. That might explain why you aren't getting the result you expect, especially since it's only happening near objects. You can see this process at work; AutoCAD will display a symbol at the snap point (which symbol depends on the type of snap). You can test this hypothesis by turning off the object snap tool. There are several ways to do so: type OSNAP and clear the "Object Snap On" checkbox; press the F3 key; click on the Osnap toggle button on the status bar (if your status bar is visible). I can't find that command on the ribbon.

What version of AutoCAD? Are you picking boundary edges? Would the lengthen command be more appropriate?