The best growth stocks for beginners are those companies that you can buy and forget, like recruiter Robert Walters(LSE: RWA). In my opinion, this is an excellent buy for beginner investors because it is a relatively simple business. The group is an international recruitment firm that specialises in finding "the highest calibre professionals" to fill job positions required by its clients.

And while recruitment is a cyclical business, in the boom times it is very profitable -- as the company's most recent figures show. However, I believe that these growth targets are a conservative estimate. A trading update from the company, published this morning, showed 17% year-on-year growth in net fee income for the three months to the end of March. All of the regions Robert Walters operates in reported strong growth, particularly in Europe where net fee income jumped 32% on a constant currency basis.

Even uncertainty about the UK's economic outlook did not hold back growth. Net fee income for UK hiring expanded 6% in constant currency year-on-year for the first quarter. As well as Robert Walters' growth, the other desirable quality this business has is its cash generation. At the end of March, the balance sheet was stuffed with £34m of net cash, up 156% on last year and comprising 6.5% of the firm's market capitalisation.

Another fast-growing undervalued business I think would be a good pick for beginners' portfolios is staffing solutions company Staffline(LSE: STAF). For 2018, City analysts are expecting the company to report earnings per share growth of 50%, a rate of growth that, in my opinion, is not reflected in Staffline's lowly valuation of 8.3 times forward earnings. As my Foolish colleague Roland Head pointed out at the end of January, Staffline's earnings per share have grown by an average of 18% per annum since 2011, as the company has augmented organic growth with acquisitions.

These deals have helped to offset weakness at the firm's PeoplePlus division, which provides staff for mainly public sector clients. Profits here fell 10% last year as the group continued to wind down its Work Programme scheme. Still, Staffline has plenty of other growth avenues available to it. For example, last month the group acquired blue collar recruitment business Endeavour Group Limited, and in February, two other smaller deals were completed, contributing a total of £88m to Staffline's top line.

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Brookfield Asset Management has compounded its dividend in the double-digit range over the last decade and the pace has increased in the recent years (18.5% CAGR over the last three years). The firm recently raised its payout by more than 7% and is expecting a 22% total return over the next five years. Mike: Brookfield is an alternative asset manager with over 100 years of operation.

What are alternative assets, The 4 divisions they manage: Real Estate, Infrastructure, Renewable Energy, and Private Equity. Those are interesting sectors if you are looking to diversify your portfolio in other types of industries. Sabeel: I like to consider this as an alternative investment, based on the types of investments the company makes and the kind of exposure provided. The umbrella corporation provides exposure to global infrastructure projects and assets via BIP.UN, global real estate assets via BPY.UN, renewable energy projects via BEP.UN, and private equity.

Brian: One of the appeals of Brookfield Asset Management is its well-diversified base of assets, which span everything from infrastructure to renewable energy, real estate, and private equity. The company follows disciplined investment habits, which have enabled it to grow its dividend at a double-digit annual rate over the past decade.