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Getting started in stock with one special field of activity
You are always best off investing in things you understand. If you have a deep understanding of the aeronautical industry, say, you are a Vice President at Boeing and have been working at Boeing for 40 years, then that would be a reason for investing in that sector: because you may be able to better evaluate different companies in that sector. If you are a novice in the sector, or just have an amateur interest in it, then it may not be a good idea, because your knowledge may not be sufficient to give you much of an advantage. Before focusing on one investment of any type, industry sector based, or otherwise, you want to ask yourself: am I an expert in this subject? The answer to that question will have a big impact on your success.