<p>Firstly, thank you for contributing to our site already. I've noticed you several times and have already been glad of your positive presence.</p>

<ul>
<li><p>there are a good number of more or less easy questions here, but they tend to come in "waves". In particular, there are lots of <code>self-study</code> questions, some of which are quite simple (posted by students at the start of a subject like one you've completed). If you keep in mind the <a href="https://stats.stackexchange.com/tags/self-study/info">guidelines</a> on answering such questions there's often a useful contribution to be made.</p></li>
<li><p>there's thousands of unanswered questions; our unanswered questions rate is one of the higher ones on the SE network (for a variety of reasons). The high voted ones won't likely be ones you can respond to (since they've been looked at a lot, so high-voted ones that don't have an answer are probably tricky to answer for one reason or another), but among the ones with few votes there's quite a few which are simple to answer and some of those will be within your skills.</p></li>
<li><p>more <em>votes</em> are sorely needed. On questions where you are able to tell a more helpful answer form a less helpful one, vote up a good answer. Vote up interesting, well-researched or thought provoking questions, or ones that generate interesting answers.</p></li>
<li><p>Your English skills are apparently excellent, so there's the opportunity to suggest edits; often questions are in terrible shape and every bit of that stuff helps.</p></li>
<li><p>sometimes linking to a related answer (or flagging a duplicate) can be very helpful. If you remember a relevant answer to a different question, a link in comments can be an important contribution. The value of that sort of 'site curation' is easy to underestimate.</p></li>
<li><p>even when a simple question has been correctly answered, sometimes a correct but more technical answer is less helpful to an OP who has few mathematical skills than a wordier one pitched at the "right" level.</p></li>
<li><p>don't worry too much if some of your answers generate discussion,  disagreement or even downvotes. I can point to plenty of my own answers that were wrong, or where I misunderstood, or gave a poor answer, and some of those were quite rightly downvoted. Being wrong is a crucial aspect of learning, and many of the most valuable contributions on the site are in the discussions in comments over a contentious point. <em>I've learned a lot from being wrong</em>! </p></li>
<li><p>Wrong or contended answers are actually more broadly helpful in their own way - as long as someone explains why they're wrong or not the whole story - since that will correct not just the misconceptions of the answerer but also misconceptions of later readers that might otherwise never have their understanding challenged. So I've also learned quite a lot from other people being wrong too.</p></li>
<li><p>ask good questions! We have lots of questions, but not always so many good ones. Having some people around who can express a question clearly and thoughtfully is the lifeblood of the site (it's hard to answer a question if it doesn't get asked). If you have something you want to know about that you can't find a good answer by searching, go ahead and ask. Getting someone else to give a good answer is adding value we wouldn't have otherwise.</p></li>
<li><p>you can also contribute here on meta. You represent a lot of the readership/users of the site, but that readership is vastly under-represented as far as guiding how we operate. Opinions given on meta are part of the guidance on how the site works (upvoted answers to meta questions are actually a way to guide the informal policies under which we try to operate), but they mostly come from answerers, rather than askers and readers. </p></li>
</ul>

<hr>

<p>In respect of the first two points above, here are some useful searches which might suggest other searches to try:</p>

<p><a href="https://stats.stackexchange.com/search?tab=newest&amp;q=[self-study]%20answers%3a0">new unanswered self-study</a></p>

<p><a href="https://stats.stackexchange.com/search?tab=relevance&amp;q=[self-study]%20answers%3a0">relevant unanswered self-study</a></p>

<p><a href="https://stats.stackexchange.com/search?q=beginner+answers%3A0">relevant unanswered "beginner"</a></p>

<p><a href="https://stats.stackexchange.com/search?q=basic+answers%3A0">relevant unanswered "basic"</a></p>

<p>Search engines can also be used fruitfully in ways the on-site search 
  does less well on (searching information in comments for example). If your
  Google-fu is good, you can get good results that way.</p>
