Anona There is only one way of learning to make jams and chutneys. Give it a try and learn from your mistakes, because, believe me, you will make mistakes. My family still remember my first attempt to make strawberry jam, the result better described as a strawberry thin pouring sauce.
Use a good reliable recipe. Mine come from a book of jam and chutney recipes I bought nearly 50 years ago and I use it for all my basic recipes then over the years I have added extra ones I have picked up or been given.
Currently there are 18lbs of crab apples sitting in a bin outside the kitchen door. These will be cooked in 6lb batches. What I do with the apple juice after boiling and straining will vary. I will take off small quantities to make herb jelly; mint, sage and rosemary, which I use in cooking or as a condiment with roast meat. Most will be reboiled with blackberries and strained again to be turned into bramble jelly. This is popular with family members so I make a lot of it. What is left will be turned into apple jelly.