Using Rocket Spanish to speak Spanish in Spain

I am aware that the Spanish language in this course is South American “world” Spanish.

Living in the UK, it is far more likely that I will be speaking Spanish in Spain as it's far closer. So: 

1. Will I be understood speaking world Spanish in Spain? 
2. Will I be able to understand Spanish in Spain? 
3. What are the main differences, or are there too many to mention?
4. Are there other resources that I can use so I can learn to speak  the Spain Spanish?

Thank you!

I do not speak Spanish yet , only a year into my studying , but you can use bluebird languages and pick Spanish from Spain, It is free no paywalls at all, or Mondly is also great it only offers Spain spanish and both are great to see conjugations . In my time  studying for all of 2020 there is plenty of differences between Mexican and Spain Spanish but nothing to big, Boleto vs billete  , Verduras vs vegetales , and of course vosotros but I am slowly getting a grasp on it and it all mostly follows a predictable path, I am not good at it yet but once you know the verb its not too difficult to guess the correct present /past and future tense of yo , ella , ellos, vosotros , Tu ect.. 

Thank you Nicholas for your response and recommendation.

I will study with Rocket and Bluebird so I will be able to get the differences.