Sounds like the battery needs to be replaced if it is old or the connection to the battery is lose and needs tightening. Is there corrosion around the circular connectors on top of the battery? If so, clean it off and consider replacing them if needed. That's my best guess.
needs new battery or starter drawing too much current
first of all what kind of car ?
Dead battery and/or alternator.
The batterie cables are usually the easiest
You need a new battery.
the engine wont start unless you have the immobalizer key
Check the timing in the caravan. It sounds like the timing has jumped, and the engine could backfire then not start, and could not even turn over.
Test battery with a load tester. If battery passes you have a problem with connections or cables.
Dead battery and/or alternator.
Get a new battery, Auto parts stores sell them.
The security light has a faulty fuse and needs replaced. The vehicle not starting unless boosted means the battery has a dead cell in it .
The batterie cables are usually the easiest
Defective alternator.
You need a new battery.
It has either . jumped timing
The battery cables may be corroded. If cleaning them doesn't solve the problem, have the battery tested.
lack of fuel
Check your timing. Is it possible your timing chain has jumped a tooth?
Check the battery cables. If there is no corrosion and you have good connections, then the starter solenoid/relay may be at fault.